The U.S. Customs Service is a main source of data for:

An increase in net exports shifts the aggregate demand curve to the left.

a. true b. false

Possible solutions to omitted variable bias, when the omitted variable is not observed, include the following with the exception of

A) panel data estimation. B) nonlinear least squares estimation. C) use of instrumental variables regressions. D) use of randomized controlled experiments.