Austin is in the grocery store with his mom and he sees the candy-like cereal his saw advertised on television. He asks his mom to purchase and she says no. He continues to beg, bargain, and pout until she concedes. Austin demonstrated power.

pester

Explanation:

The power of children, by constant nagging or pestering, to force their parents to purchase marketed or trendy products. In other words, the tendency of the child to nag the parent unceasingly before the parent listens to the child's appeal. The increase in the problem of pester power is directly connected to the growth of advertisements. As per the question, Austin repeatedly nags until his mom buys that product and therefore example of pester power.