Two videos on the Financial Times website show interviews with Burton Malkiel, and Benoit Mandelbrot (a famous mathematician). Both take slightly different views on efficient markets. Here are links to the two videos*:
The two may not seem connected, but they are more so than you might think. In the comments section below, write 20-40 words on what you think of efficient markets, based on the two interviews.
*The FT does not allow embedding of its videos on external sites so, unfortunately, you have to go there and watch it. Links will open in external windows/tabs.