Research on the long-term retention of knowledge learned through formal instruction leads to the conclusion that retention depends on the length of time over which initial learning takes place. according to your text, this is another instance of the powerful mnemonic benefits of

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Shari is trying to decide how she should use her cash birthday gifts. her choices are new clothes, a concert ticket, or donating the money to her favorite charity. shari decides to donate the money. the value given up by not choosing both the clothes and the concert ticket is called a . a.) trade-off b.) opportunity cost c.) retail price