The quantity demanded of Good A has recently increased by 2% in response to an increase in income. By how much must income have increased (as a percentage) for the income elasticity of demand to equal 0.2?

Aldrich and co. sold goods to donovan on credit. the amount owed grew steadily, and finally aldrich refused to sell any more to donovan unless donovan signed a promissory note for the amount due. donovan did not want to but signed the note because he had no money and needed more goods. when aldrich brought an action to enforce the note, donovan claimed that the note was not binding because it had been obtained by economic duress. was he correct? [aldrich & co. v. donovan, 778 p.2d 397 (mont.)]

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According to this excerpt, a key part of our national security strategy is