The 2 biggest chocolate manufacturers in the world say they can not keep up with the demand for the sweet treat.   Drought and disease is partially to blame for the lack of cocoa but there's another reason too - our appetite.  Experts say the demand for chocolate is greater than it has ever been.  By 2020, the demand for chocolate is anticipated to exceed supply by 1 million TONS.  Expect prices to go up.  You can also expect candy makers to start using more fillers like nuts and nougats to stretch out their supply.

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