Considering 30-days investment horizon, Exxon Mobil Corporation is expected to under-perform the Merck. But the stock apears to be less risky and, when comparing its historical volatility, Exxon Mobil Corporation is 1.37 times less risky than Merck. The stock trades about -0.37 of its potential returns per unit of risk. The Merck & Inc. is currently generating about -0.13 of returns per unit of risk over similar time horizon. If you would invest 3,846 in Merck & Inc. on April 26, 2012 and sell it today you would lose (91.00) from holding Merck & Inc. or give up 2.37% of portfolio value over 30 days.
Diversification
Weak diversification
Overlapping area represents amount of risk that can be diversified away by holding Exxon Mobil Corp. and Merck & Co. Inc. in the same portfolio (assuming nothing else is changed)
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