The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.By David Gillie for ETF Digest NEW YORK ( ETF Digest) -- No matter what, people have to eat -- 7 billion of them now globally. You can't eat your iPhone. You can't eat your gold coins. And you can't eat oil. Feeding the world is big business and agriculture is a high tech industry. Farmers have to maximize crop yields with exact fertilizer blends for individual crops and conditions. Grains, fruits and vegetables have to be hybridized and engineered to grow outside of ideal soil conditions and climates. A John Deere harvesting combine is a complex piece of technological equipment costing as much as a Lamborghini ($250,000). Supplying the needs of farmers to feed the globe is one of the world's fastest growing industries.