4c) R code for overall holistic model of USA agriculture 1990-2017

This code runs a holistic model of USA agricultural production 1990-2017. It is stochastic. The current code is set up to do a run of 125 iterations.
To fully reproduce results produced in the accompanying paper, the model should be run for 125 iterations, setting the seed at 1987, 1988, 1989 and 1990.
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