Why do stores and manufacturers use mail in rebates? A scam, or is there a way to use them effectively?
Some notable percentage of buyers won't even try to do the rebate, or will forget - so it's a [relatively] cheap incentive to the consumer than most will miss out on.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Why do stores and manufacturers use mail in rebates? A scam, or is there a way to use them effectively?

### Response:
Some notable percentage of buyers won't even try to do the rebate, or will forget - so it's a [relatively] cheap incentive to the consumer than most will miss out on.