State whether each of the following statements is true or false and explain it with at least one reason.

1.Wages and employment should decrease in the short run in a metropolitan area that experiences an increase in pollution.

2. One of the sources of agglomeration economies is matching. It states that unemployed individuals are more likely to find jobs in bigger cities.

3. The principal reason wages remain higher over time in big cities is that housing is more expensive in big cities.

4. Government fragmentation contributed to suburbanization in the U.S. Unlike other developed countries, U.S. local governments have extensive land use controls.