Decades ago, in Northern San Diego County, there was a kid who saw that with all the people that owned horses in the area, he could earn some extra cash cleaning horse stalls in the afternoon after school. Well, he got clients fast. Then he had too much business. So, he got a few other kids who were his friends to join him. Soon, they got to the point where each of them had all the business that they could handle.
That’s when the next idea came up. Why simply throw the manure away? So, he went out and sold the manure to landscaping companies all over the region to use as fertilizer. If I recall correctly, by this time all of the kids were still only 13 or 14. That core group then hired younger kids as subcontractors. And, of course, they got even more clients.
By the time each of them graduated high school (late 80s or early 90s) each of those kids was a millionaire. Imagine graduating high school and already being a millionaire.
You may look and see a pile of manure and wonder why nobody takes care of it, I guarantee you someone else will look at that and see an opportunity.