Their effective yield-to-cost is astronomical.

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The PowerShares DB Oil ETF attempts to minimize the negative effects of contango by buying the contract month with the highest effective roll yield when necessary.

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However, on May 30, 2012, the company paid a special dividend of 71.3 cents per ADS. As a result, the effective dividend yield of Grupo Aeroportuario is currently around 6.44%, which is significantly above its 5-year average dividend yield of 3.6%.

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Success in these three areas will yield significantly greater return on investment than outsized wage hikes in the form of improved development programs (which, in turn, yield more effective and capable local talent), higher employee engagement (results in more productive and motivated talent with lower turnover), and a more stable and capable local team.

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And new medicines ultimately yield a legacy of cost-effective generics, which today account for 80 percent of U.S. prescriptions and are actually less expensive here than in other countries around the world.

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Solving that puzzle could yield treatments, but perfecting a potent vaccine would be a preemptive--and far more effective--form of attack.

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