Simplify the following text for a Grade 6 native English-speaking person.
Original: As Adam Smith noted , having money gives one the ability to `` command '' others ' labor , so purchasing power to some extent is power over other people , to the extent that they are willing to trade their labor or goods for money or currency .
Simplified: Some people have money . Adam Smith says that the purchasing power is the amount of money needed to labor ( goods or services ) from other people .