Jaffe found that stock prices after insiders intensively bought shares and after insiders intensively sold shares.

increased, decreased

Explanation: The following case relates to insider trading which refers to the situation when some employees of the organisation,having private information regarding the decisions uses that information for gaining profit in the stock market by treading their company's stock.

When the insiders extensively bought the stock which means the company is going to make a decision from which the stock price is gonna rise and vice versa.

1. c

2. b

3. a

4. c

5. a

6. b

7. c

8. c

9.b

10. d

just took it 100%