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stata代写-EC639

时间：2021-02-14

EC410C/EC639 Assignment (100 marks total)

Instructions: hand in your answers in a single file (plus log file) through MyLearningSpace, in

the Dropbox. You may use pen/pencil and draw diagrams/equations on paper, and then take

pictures of these diagrams. Insert these pictures into your Word document/PDF and submit

everything as one file. Please do your own work and do not hand in someone else’s answers,

although you may discuss questions with other classmates.

Steps to assignment

1. Complete questions 1-4. Diagrams can be drawn and scanned or pictures inserted into

your document.

2. Do the data analysis needed for question 5. Be sure to do the “set seed” step (see below).

Generate a log file for all of your steps in Stata, and include a PDF of your log file in

your submission so I can verify you did your own analysis. You can submit a separate

PDF for your log file or append the log file to your other question answers.

3. Using the Stata analysis, answer question 5. Include the table of regression results and

written answers in the same document as questions 1-4.

4. Compile everything into one file (Word or PDF) including your log file (save as a PDF

and then append to your other answers) if possible. If you need to submit your log file

separately as another PDF that is fine as well.

Questions

1. (16 marks) In a Ricardian model, there are two countries: Canada (has 600 units of

labour) and Japan (has 300 units of labour). Two goods are produced: pancakes and

waffles. The unit labour requirements are:

= 10

= 3

= 3

= 1.5

a) (4 marks) What is Canada’s comparative advantages and absolute advantages (if

any)? Show your work for full marks.

b) (4 marks) draw the RS curve, including the relative prices at the horizontal steps and

the relative quantity on the vertical part.

c) (4 marks) Suppose that Canada and Japan open up to trade. Assume that the RD curve

intersects the RS curve when the relative price of pancakes equals 3. Show the gains

from trade for Japan using a diagram and labelling relevant parts of the diagram with

numbers. Summarize how Japan gains from trade in words as well, in a brief

sentence.

d) (4 marks) Suppose both countries double the amount of labour they have. Draw and

explain how the RS curve would change (including any labelled values in b)), and

briefly explain how this would affect the pattern of trade.

2. (17 marks) in an HO model, there are two countries: Gondor (capital abundant) and

Mordor (labour abundant). Two goods are produced: catapults (capital-intensive) and

spears (labour-intensive). Express everything in terms of catapults.

a) (4 marks) Draw an RS-RD diagram showing the two countries relative supply curves

in terms of catapults. Use this diagram to argue what would happen to the relative

price of catapults in Gondor if it opens up to trade with Mordor.

b) (8 marks) Describe what happens to the following things in Gondor when it opens up

to trade with Mordor: w/r, L/K per sector, output per sector. Use diagrams when

necessary to show what happens to each.

c) (5 marks) Suppose that you observe, in reality, Gondor and Mordor opening up to

trade. You see that Gondor exports the good whose relative price drops from pre to

post-trade. Is this enough to conclusively prove that HO-based comparative

advantage drives the pattern of trade? If yes, argue why and how the evidence rules

out other models, including those of comparative advantage. If not, explain why and

what other evidence you would want to see to prove that HO-based comparative

advantage is what’s driving this pattern of trade.

3. (17 marks) increasing returns to scale with symmetric firms:

a) (5 marks) Show, using algebra, what happens to the varieties available to consumers

(n) and prices when one country opens up to trade with another identically sized

country.

b) (4 marks) Suppose that the marginal cost c decreases. Explain how this affects: i) pre-

trade prices, ii) pre-trade number of firms/varieties, and iii) the size of the gains from

trade in terms of the price drop (hint: similar to c) from the practice problems!).

c) (4 marks) Suppose that b = 1, F = 10, c = 2. If France has a market size of 1000 and

Germany has a market size of 2000, calculate the change in varieties available to

French consumers as well as the change in price to French consumers.

d) (4 marks) Using the same values and setup as part c), suppose that the French

manufacturers’ association claims that the losses in manufacturing employment in

France exceed any gains from trade. Suppose that France contains 1/3 of the post-

trade firms that exist after market integration with Germany. Suppose also that each

unit of output costs 2 workers to produce. If we further assume that each

manufacturing worker is worth $30, what would the gains from trade have to be less

than in order for the claim by the French manufacturers’ association to be true?

4. (26 marks) Melitz model questions:

a) (4 marks) Derive a firm’s profit function in terms of its productivity, () =

()−1 − . You can use the equation for a firm’s price in terms of its

productivity and the fact that revenues are equal to [

()

]

1−

.

b) (4 marks) Solve the firm’s profit maximization problem to derive what price a firm

charges given its productivity .

c) (6 marks) Derive the cutoff productivity for exporting and show why all exporters

will always operate in the domestic market as well (i.e. that cutoff for exporting is

higher than domestic cutoff)

d) (6 marks) Explain how opening up to trade in the Melitz model benefits consumers

via larger varieties and lower prices. Use algebraic expressions when possible, and

intuitive explanations otherwise.

e) (6 marks) We can express the post-trade varieties available to consumers as (1 + ∗

), where is the amount of domestic varieties available in a country post-

trade, n is the number of other countries in the world, and is the probability

that a firm draws a productivity high enough to enable them to export. Suppose that

is the autarky (no-trade) amount of varieties available to consumers in a given

country. We know that < because of exit of the lowest-productivity consumers

post-trade. Use (1 + ∗ ) to show how post-trade, the number of varieties

available to consumers in a given country might potentially be smaller (hint: it might

help to expand the term and remember that all countries are identical).

5. (24 marks) This question will require the use of the dataset, ADH_L5.dta. In addition to

any tables and answers required, please also provide a log file of your entire procedure

used to generate the regression output needed, as well as any data cleaning you did from

the base dataset (i.e. open the log file first thing after opening Stata, before even opening

the assignment dataset). If you don’t know how log files work, you can type “help log”

into the Stata command window or look up online resources to help with log files in

Stata. Not including a log file will result in penalties including getting a zero on this

question. You can save the log file as a PDF after generating it and include it in your

submission as a separate file on MyLS, or combine the log file with your Word document

and hand everything in as one file.

Before starting, note a few things. First, always use heteroskedasticity robust standard

errors unless otherwise stated. Second, I want you to implement the following steps in

Stata immediately after you open the dataset:

set seed abcd

gen x = rnormal()

sort x

keep if _n<=500

drop x

In the above code, replace abcd with the last 4 digits of your student number. If you

remember from our project paper selection, this generates a unique random variable x,

which you will then sort. The next step (keep if…) will keep only the first 500

observations in your data, which will be unique for each student because of the random

sorting. Note that this means all coefficients should be different for every student, so

please be sure to do your own work! Handing in identical numbers as another student

may lead to suspicions of academic misconduct.

For all regressions, the dependent variable (left hand side) will be the log of average

weekly wages for manufacturing workers in USD; this is called l_avg_lnwkwage_mfg in

the dataset. The main independent variable will be exposure to Chinese imports (in

thousands of USD) per worker in a given commuting zone; this is called l_tradeusch_pw

in the data.

Some of the Stata commands you may find useful are already listed in the metrics review

lecture slides. If you ever need help with how a particular command is supposed to be

used, you can either type help and then the name of the command, or go online and

search for the command (typing the command name and then Stata usually does it); this

should pop up the help files for each command.

Here is a table of other variables for the analysis:

Variable name in data description

l_tradeotch_pw instrument (IV) for import exposure

l_sh_empl_f share of employed people that are female

l_sh_popfborn share of population born outside US

l_popcount population

l_sh_popedu_c share of population with a college degree

l_sh_routine33 share of employment in “routine” jobs

that don’t require a lot of creativity or

problem solving that can be done by

following sets of rules or instructions

Follow the instructions and answer the questions below. Good luck! To receive marks

for this question, submit your log file containing all work done to generate results.

Not performing the “set seed” set of steps above will result in loss of marks in this

question.

a) (12 marks) Produce a table with the following 4 regressions displayed:

i) a regression with wages on the LHS and import exposure on the RHS

as described above,

ii) same regression as i), but including an additional control variable

(don’t choose the IV!) of your choice from the table,

iii) same variables as ii) but now using the instrument for the import

exposure measure,

iv) same regression as in iii) but clustering standard errors by state.

Each column in your table should be a different regression, and you should

include coefficient estimates + standard errors for each variable and report the R-

squared and observation counts of each regression. For an example of table

formatting from one of my own papers, see below after all the questions.

b) (4 marks) Explain why you chose your additional control variable in a) ii); what issue

is its inclusion resolving (be as specific as possible, referencing the specific variable)?

Look at the coefficient estimates across regressions i) and ii): what does any change

(or lack of change) in the coefficients tell you about what your control variable is

doing?

c) (4 marks) Compare columns ii) and iii) in your table, and describe the difference in

the coefficient on import exposure, if any. What does the difference in the coefficient

(if any) tell you about whether there were issues using only OLS?

d) (4 marks) Compare the coefficients and standard errors obtained between columns iii)

and iv). Using your results, explain whether clustering makes any difference in the

coefficients, standard errors, or levels of statistical significance. Use these

comparisons to briefly explain why using clustering incorrectly (or not at all) may

potentially lead to incorrect conclusions.

Example of regression table formatting (resize table if it’s too small on your screen)

学霸联盟

Instructions: hand in your answers in a single file (plus log file) through MyLearningSpace, in

the Dropbox. You may use pen/pencil and draw diagrams/equations on paper, and then take

pictures of these diagrams. Insert these pictures into your Word document/PDF and submit

everything as one file. Please do your own work and do not hand in someone else’s answers,

although you may discuss questions with other classmates.

Steps to assignment

1. Complete questions 1-4. Diagrams can be drawn and scanned or pictures inserted into

your document.

2. Do the data analysis needed for question 5. Be sure to do the “set seed” step (see below).

Generate a log file for all of your steps in Stata, and include a PDF of your log file in

your submission so I can verify you did your own analysis. You can submit a separate

PDF for your log file or append the log file to your other question answers.

3. Using the Stata analysis, answer question 5. Include the table of regression results and

written answers in the same document as questions 1-4.

4. Compile everything into one file (Word or PDF) including your log file (save as a PDF

and then append to your other answers) if possible. If you need to submit your log file

separately as another PDF that is fine as well.

Questions

1. (16 marks) In a Ricardian model, there are two countries: Canada (has 600 units of

labour) and Japan (has 300 units of labour). Two goods are produced: pancakes and

waffles. The unit labour requirements are:

= 10

= 3

= 3

= 1.5

a) (4 marks) What is Canada’s comparative advantages and absolute advantages (if

any)? Show your work for full marks.

b) (4 marks) draw the RS curve, including the relative prices at the horizontal steps and

the relative quantity on the vertical part.

c) (4 marks) Suppose that Canada and Japan open up to trade. Assume that the RD curve

intersects the RS curve when the relative price of pancakes equals 3. Show the gains

from trade for Japan using a diagram and labelling relevant parts of the diagram with

numbers. Summarize how Japan gains from trade in words as well, in a brief

sentence.

d) (4 marks) Suppose both countries double the amount of labour they have. Draw and

explain how the RS curve would change (including any labelled values in b)), and

briefly explain how this would affect the pattern of trade.

2. (17 marks) in an HO model, there are two countries: Gondor (capital abundant) and

Mordor (labour abundant). Two goods are produced: catapults (capital-intensive) and

spears (labour-intensive). Express everything in terms of catapults.

a) (4 marks) Draw an RS-RD diagram showing the two countries relative supply curves

in terms of catapults. Use this diagram to argue what would happen to the relative

price of catapults in Gondor if it opens up to trade with Mordor.

b) (8 marks) Describe what happens to the following things in Gondor when it opens up

to trade with Mordor: w/r, L/K per sector, output per sector. Use diagrams when

necessary to show what happens to each.

c) (5 marks) Suppose that you observe, in reality, Gondor and Mordor opening up to

trade. You see that Gondor exports the good whose relative price drops from pre to

post-trade. Is this enough to conclusively prove that HO-based comparative

advantage drives the pattern of trade? If yes, argue why and how the evidence rules

out other models, including those of comparative advantage. If not, explain why and

what other evidence you would want to see to prove that HO-based comparative

advantage is what’s driving this pattern of trade.

3. (17 marks) increasing returns to scale with symmetric firms:

a) (5 marks) Show, using algebra, what happens to the varieties available to consumers

(n) and prices when one country opens up to trade with another identically sized

country.

b) (4 marks) Suppose that the marginal cost c decreases. Explain how this affects: i) pre-

trade prices, ii) pre-trade number of firms/varieties, and iii) the size of the gains from

trade in terms of the price drop (hint: similar to c) from the practice problems!).

c) (4 marks) Suppose that b = 1, F = 10, c = 2. If France has a market size of 1000 and

Germany has a market size of 2000, calculate the change in varieties available to

French consumers as well as the change in price to French consumers.

d) (4 marks) Using the same values and setup as part c), suppose that the French

manufacturers’ association claims that the losses in manufacturing employment in

France exceed any gains from trade. Suppose that France contains 1/3 of the post-

trade firms that exist after market integration with Germany. Suppose also that each

unit of output costs 2 workers to produce. If we further assume that each

manufacturing worker is worth $30, what would the gains from trade have to be less

than in order for the claim by the French manufacturers’ association to be true?

4. (26 marks) Melitz model questions:

a) (4 marks) Derive a firm’s profit function in terms of its productivity, () =

()−1 − . You can use the equation for a firm’s price in terms of its

productivity and the fact that revenues are equal to [

()

]

1−

.

b) (4 marks) Solve the firm’s profit maximization problem to derive what price a firm

charges given its productivity .

c) (6 marks) Derive the cutoff productivity for exporting and show why all exporters

will always operate in the domestic market as well (i.e. that cutoff for exporting is

higher than domestic cutoff)

d) (6 marks) Explain how opening up to trade in the Melitz model benefits consumers

via larger varieties and lower prices. Use algebraic expressions when possible, and

intuitive explanations otherwise.

e) (6 marks) We can express the post-trade varieties available to consumers as (1 + ∗

), where is the amount of domestic varieties available in a country post-

trade, n is the number of other countries in the world, and is the probability

that a firm draws a productivity high enough to enable them to export. Suppose that

is the autarky (no-trade) amount of varieties available to consumers in a given

country. We know that < because of exit of the lowest-productivity consumers

post-trade. Use (1 + ∗ ) to show how post-trade, the number of varieties

available to consumers in a given country might potentially be smaller (hint: it might

help to expand the term and remember that all countries are identical).

5. (24 marks) This question will require the use of the dataset, ADH_L5.dta. In addition to

any tables and answers required, please also provide a log file of your entire procedure

used to generate the regression output needed, as well as any data cleaning you did from

the base dataset (i.e. open the log file first thing after opening Stata, before even opening

the assignment dataset). If you don’t know how log files work, you can type “help log”

into the Stata command window or look up online resources to help with log files in

Stata. Not including a log file will result in penalties including getting a zero on this

question. You can save the log file as a PDF after generating it and include it in your

submission as a separate file on MyLS, or combine the log file with your Word document

and hand everything in as one file.

Before starting, note a few things. First, always use heteroskedasticity robust standard

errors unless otherwise stated. Second, I want you to implement the following steps in

Stata immediately after you open the dataset:

set seed abcd

gen x = rnormal()

sort x

keep if _n<=500

drop x

In the above code, replace abcd with the last 4 digits of your student number. If you

remember from our project paper selection, this generates a unique random variable x,

which you will then sort. The next step (keep if…) will keep only the first 500

observations in your data, which will be unique for each student because of the random

sorting. Note that this means all coefficients should be different for every student, so

please be sure to do your own work! Handing in identical numbers as another student

may lead to suspicions of academic misconduct.

For all regressions, the dependent variable (left hand side) will be the log of average

weekly wages for manufacturing workers in USD; this is called l_avg_lnwkwage_mfg in

the dataset. The main independent variable will be exposure to Chinese imports (in

thousands of USD) per worker in a given commuting zone; this is called l_tradeusch_pw

in the data.

Some of the Stata commands you may find useful are already listed in the metrics review

lecture slides. If you ever need help with how a particular command is supposed to be

used, you can either type help and then the name of the command, or go online and

search for the command (typing the command name and then Stata usually does it); this

should pop up the help files for each command.

Here is a table of other variables for the analysis:

Variable name in data description

l_tradeotch_pw instrument (IV) for import exposure

l_sh_empl_f share of employed people that are female

l_sh_popfborn share of population born outside US

l_popcount population

l_sh_popedu_c share of population with a college degree

l_sh_routine33 share of employment in “routine” jobs

that don’t require a lot of creativity or

problem solving that can be done by

following sets of rules or instructions

Follow the instructions and answer the questions below. Good luck! To receive marks

for this question, submit your log file containing all work done to generate results.

Not performing the “set seed” set of steps above will result in loss of marks in this

question.

a) (12 marks) Produce a table with the following 4 regressions displayed:

i) a regression with wages on the LHS and import exposure on the RHS

as described above,

ii) same regression as i), but including an additional control variable

(don’t choose the IV!) of your choice from the table,

iii) same variables as ii) but now using the instrument for the import

exposure measure,

iv) same regression as in iii) but clustering standard errors by state.

Each column in your table should be a different regression, and you should

include coefficient estimates + standard errors for each variable and report the R-

squared and observation counts of each regression. For an example of table

formatting from one of my own papers, see below after all the questions.

b) (4 marks) Explain why you chose your additional control variable in a) ii); what issue

is its inclusion resolving (be as specific as possible, referencing the specific variable)?

Look at the coefficient estimates across regressions i) and ii): what does any change

(or lack of change) in the coefficients tell you about what your control variable is

doing?

c) (4 marks) Compare columns ii) and iii) in your table, and describe the difference in

the coefficient on import exposure, if any. What does the difference in the coefficient

(if any) tell you about whether there were issues using only OLS?

d) (4 marks) Compare the coefficients and standard errors obtained between columns iii)

and iv). Using your results, explain whether clustering makes any difference in the

coefficients, standard errors, or levels of statistical significance. Use these

comparisons to briefly explain why using clustering incorrectly (or not at all) may

potentially lead to incorrect conclusions.

Example of regression table formatting (resize table if it’s too small on your screen)

学霸联盟

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