If markets are efficient, why would anyone do any security research? If no one does it, what keeps markets efficient?

He following data come from the financial statements of riley company for the year ended march​ 31, 2017 ​(in millions). ​(click the icon to view the​ information.) requirements 1. prepare a cash flow statement for the year ended march​ 31, 2017. not all items given appear on the cash flow statement. 2. what activities provided the largest source of​ cash? is this a sign of financial strength or​ weakness? requirement 1. prepare a cash flow statement for the year ended march​ 31, 2017. not all items given appear on the cash flow statement. ​(use parentheses or a minus sign to show cash​ payments, cash​ outflows, and/or a net decrease in cash. if a box is not used in the statement of cash flow leave the box​ empty; do not select a label or enter a​ zero.) riley company statement of cash flows year ended march 31, 2017 millions cash flows from operating activities: net cash provided by (used for) operating activities