Answer:
While self-interest is the motivating force behind the free market, competition is the regulating force. Self-interest and competition work together to regulate the marketplace. Self-interest spurs consumers to purchase certain goods and services.
Explanation:
To my knowledge this would be known as affiliate marketing
Make musical instruments with your children. ...
Sing to them. ...
Teach them to whistle. ...
Play musical games. ...
Play music in the background. ...
Let them play with instruments. ...
Give them musical colouring in.