An example of barter is voluntary work at an old-age home

Consider a large open economy that has a zero current account balance

What are the effects on the world real interest rate, national saving, investment, and the current account balance in equilibrium if (a) future income rises? (b) business taxes decline? (c) government purchases decline? (d) the future marginal product of capital declines?

The following estimation methods should not be used to test for randomization when Xi, is binary:

A) linear probability model (OLS) with homoskedasticity-only standard errors. B) probit. C) logit. D) linear probability model (OLS) with heteroskedasticity-robust standard errors.