How was the Soviet Union able to begin taking control of Eastern Europe
following WWII?

Soviet troops were already stationed in Eastern Europe during the war which made it easier for them to take control

he risk-return relationship. generally, the higher the potential return of an investment, the higher the risk. there is no guarantee that you will actually get a higher return by accepting more risk. diversification enables you to reduce the risk of your portfolio without sacrificing potential returns.

explanation:

less available tax revenue

this basically means that when they get money from taxes wirth having a lower gdp they get less then what others have with a higher gdp