Recall the three types of claims and the four big validities. Explain which validities are most relevant for each of the three types of claims. Researchers do not usually aim to achieve all four of the big validities at once, why not?

Which of the following correctly describes a repurchase agreement? the sale of a security with a commitment to repurchase the same security at a specified future date and a designated price. the sale of a security with a commitment to repurchase the same security at a future date left unspecified, at a designated price. the purchase of a security with a commitment to purchase more of the same security at a specified future date.