The firm's long-run supply curve begins at an output of

Let W be the included exogenous variables in a regression function that also has endogenous regressors (X). The W variables can

A) be control variables B) have the property E(ui|Wi) = 0 C) make an instrument uncorrelated with u D) all of the above

There are frequently market solutions that the government can use to deal with externalities

a. True b. False Indicate whether the statement is true or false