Discussion about TV commercials ,are they good or bad for children?

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Without doubt, children are recognized as having tremendous spending power and purchase influence in today's market. So, most manufacturers of children's products like to use TV commericals with a vivid visual, hearing, and motion to appeal to children's attention. Obviously, TV commericals have been influecing children's behaviors, their consuming habits, eventually, making parents spending more money on products their children want. What do you think, TV commercials are good or bad for children?