Price controls are believed to prevent monopolies by stopping a company from setting prices too low or too high
made by governments with a purpose of discouraging competition in the economy
set prices for goods and services that only government-approved businesses may offer
a system of government laws and regulations that control how people run their businesses

both are true, the congress does have the power to create banks, even if this power is not specifically described in the constitution, since there is nothing restricting it and there is power given to the congress to make "all laws which shall be necessary and proper". maryland was not allowed to tax a branch of the national bank operating there, and the supreme court decided that no state could. both of these topics were discussed in a decision of the mcculloch v. maryland case in 1819.