Economics

Public goods are non-excludable, so they suffer from a free-rider problem.

Speculators from rushing into and out of a country's market and disrupting its economy./

Civil Rights, those rights that most take for granted. Segregation affected all aspects of life for those segregated; Politics, Social, Educational, Judicial, etc.

an increase in standard of living comes from increase in income. An increase in national income will increase the standard of living of the people of that nation.
Income

Farmer's market where fresh products are sold hearby.

Rationing is not an example of a trade restriction.

The development of a new energy source reduces production costs for a company.

The friend buys millions of dollars in Treasury bonds

A restriction on when a union may call a strike