In this segment from Tuesday's Investor Beat, Motley Fool analysts Mike Olsen and Morgan Housel each discuss stocks they're watching closely this week. Morgan says that for a real circus, keep an eye on Plug Power (PLUG 5.36%). The insane volatility around this stock is a symbol of the amount of speculation there is in the power market at the moment. For a stock to buy, however, Morgan tells investors why he still loves Paychex (PAYX 0.81%). Meanwhile, Mike looks at Chiquita Brands International (NYSE: CQB), and its billion-dollar deal to buy Fyffes, creating the world's largest banana supplier. Mike discusses what impact this will have on the banana market, and why it may not be struck down by regulators, despite starting to seem like a monopoly.

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