# All Questions

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### GMM: Under What Conditions Does Adding a Seemingly Unrelated Moment Condition Increase Efficiency?

For simplicity, I'll offer the simplest of endogenous models. Suppose we have the following scalar model: $y=\beta x+u$ where $E[ux]\neq 0,\;E[uz]=0\; \text{and}\;E[u^2|z]=\sigma^2$ Clearly we can ...
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### What is the difference between the discrete choice method and the generalised cost method in transport planning?

I have been using the generalised cost method in an agent based model. The generalised cost method enables each individual agent to make a decision on what mode of transport it will take given a range ...
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### Reference Request: Cost Benefit Analysis of Conversion of Undeveloped Land for Housing

London is surrounded by a "green belt", a large area which government policy has protected from housing development. The current high cost of housing in London has led some to advocate a selective ...
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### Definition: Extractive Goods (Comtrades HS-Categorization)

I'm currently writing a paper on China in Africa and I'd like to compare Africas Exports to China with its exports to Europe and the USA. More specifically I'd like to find out if the Exports to China ...
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### How do I convert real gdp into chained-dollar real GDP?

I have quarterly data for real GDP from 1981-2015. I also have quarterly chained-dollar real GDP from 61-2012. I need to have them converted into one series. I've looked up several different formulas ...
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### Proof of Proposition 1.4 from Microfoundations I by Kreps

Regardless of the size of X (set of all possible objects), if a preference relation which is complete and transitive is defined on it, then the corresponding choice function generated by it will ...
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### Difference-in-Difference on State Sales Tax Rates

In an attempt to evaluate a potential U.S. National Sales tax rate, it was suggested on this forum before that I consider a difference-in-difference on state sales tax rates before and after they ...
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### Ultrafilters in Social Choice Theory Literature Request

I am an undergraduate math major who is intrigued about social choice theory. I am in the early stages of planning my senior project and was wondering if anybody had some recommendations of literature ...
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### Equal Payment Series

The question is: A man is planning to retire in 20 years. Money can be deposited at 8%, compounded monthly. It is estimated that the future general inflation rate will be 3% compounded annually. What ...
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### Production in the long run - calculating wage and rental elasticity of demand

I have data for a business firm for two periods. The data include: output (Q), capital (K), labor (L), wage (W) and the rental rate of capital (R). Here they are: ...
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### Optimal commodity taxation - solving for the optimal tax rates?

I need to solve for optimal tax rates for two products. In my model there are N identical households that maximize their utility function subject to a budget ...
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### Kolmogorov-Forward-Equation with Entry and Exit

I'll try to ask this question in the most simplistic environment possible, so lets think about a household that can consume and save. After some cumbersome work, we have solved for the optimal savings ...
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### Wold Decomposition and autocorrelations of AR

Is it possible to retrieve Autocorrelations ( value or any other info) up to a certain lag for an AR(2) stationary model using the Wold decomposition? Example: X_t=0.32X_{t-1}+0.51X_{t-2}+ \...
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### Real time data map about the amount of a currency that are held in the world ?

Where can I see in real time data about the amount of a currency that is held in central banks (and maybe other significant places) ? A map would be great. I would like to know if there is an ...
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### Research on the link of QE and increased economic activity

Im looking for good literature of quantitative easing and the effects on economic actitivty. from a modelling perspective Any empirical research? What I am thinking of, is how much of an effect ...
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### Europe not self-sufficient in terms of food requirements and consumption?

An acquaintance once told me that Europe is not self-sufficient in terms of food consumption as it does not have enough farmland and farmers to produce enough for all its people, especially in terms ...
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### Applying the Martingale central limit theorem to the score process of an autoregressive model

This question is a natural continuation of the following question: How do I construct the score process of a Markov model and verify that it is a Martingale? In this problem, we set up as follows: ...
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### Differences between LATE and Heckman Selection

I have heard that a paper by Heckman and Vytlacil demonstrate comparisons between nonparametric Heckman selection (NP Heckit) and the LATE (local average treatment effect) framework. Could someone ...

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