Capitalism isn't about money. Capitalism isn't even about things that are worth money; at least not specifically. First and foremost, capitalism is about having control over others and using that control to siphon money off of them. Money that is immediately sunk into gaining more control. I'm using the term "siphon money" to mean the various practices capitalist businesses use to ensure a constant flow of money from the consumer. For example, many car dealerships also provide auto repairs because you only buy a car once, but you get the oil changed a few times a year.
The farmer isn't a capitalist, regardless of how much money they make. They're making money by operating a farm and selling food; a job that has existed long before capital was a word. The capitalist is the one that owns the farmer's land, or sells the farmer seeds every year because crops don't have seeds anymore. The person who owns the tractor company doesn't need to be a capitalist, they could always just own and operate a business. But when they make tractors in such an inconvenient way that they almost force you to buy all the repairs and upkeep from them as well, that's capitalism.
Why does the tractor company put this much effort into creating a product that is difficult for the buyer to repair? The tractor certainly wasn't cheap; it wouldn't survive farm work if it was. It's because being a capitalist, a successful capitalist, is the only protection against capitalism there is. A business that doesn't practice capitalism can't compete against capitalists; and this is where the money comes into play. Because the capitalist's main concern is control, they can dump as much money as they want solely into competition. At the basic level of economics, competition between businesses is seen as an ebb and flow of trying to meet market demands better than your competitor. The idea of spending large quantities of cash specifically on shutting out a competitor was unheard of by society at large before it became a staple of capitalist practices. Where business is limited in this practice by the profits they make, capitalism is limited only by the amount of money capitalists have as a whole.
Capitalists give each other money all the time. They expect more money back in exchange, with that interest being earned once they establish control in a given market and can begin siphoning money out of people. As long as capitalists believe control can be taken, they can afford to fund a company at a loss almost indefinitely. It happens with everything from grocery stores to websites. Capitalists help each other; all in the name of self-interest.