The law of supply-demand states that shortages coupled with rising demand causes higher prices and vice versa. But it doesn’t always apply on a permanent basis. That’s because increasing prices can inspire an increasing supply which results in lower prices.
Unless commodity producers significantly increase their volume versus fixed costs, more demand for their commodity doesn’t mean earnings increase. Because of a fast response time for changing crops, farmers and ranchers gain little or nothing as people change their food preferences. It’s also why agricultural producers can’t afford to fund aggressive long-term marketing programs. There’s simply no money in it.
To illustrate why there’s no incentive for farmers to advertise foods people should eat as recommended by nutritional and biological scientists, let’s compare agricultural commodity producers with healthcare.