Not just anyone. Only capitalists. Or, rather, only those who own the means of production within a commodity producing society. In capitalism, those owners are organised as a class. The profit motive is what drives that class, not humans in general.
I must reiterate that we're talking at cross purposes. I'm saying that profit only exists where there is commodity production. If we cannot agree on that, we won't agree about much else. Before commodity production, there was no concept of profit, and there could be no concept of a profit motive, hence humans could not be motivated by profit before they began to produce commodities.
As for your questions relating to the 'first' capitalist, you may want to read:
- Marx, Capital, vol I, Part 8 'So-Called Primitive Accumulation';
- Ellen Meiksins Wood, The Origin of Capitalism: A Longer View;
- Cedric J Robinson, An Anthropology of Marxism; and
- Immanuel Wallerstein, Historical Capitalism.
You will find some support for some of the ideas that you're talking about in these works, relating to the difficulty of pointing to a precise date at which humans began to be motivated by profit (which is impossible to pinpoint). You will also find a rejection of the argument that the profit motive is part of human nature and why. Mainly, this rejection lies in the claim that everything is historically contingent—which follows logically from an historical materialist world outlook. That will support some of your ideas but it will also challenge your main argument about what human nature is and about how we know what we know about capitalism.
For analyses on why and how profit is related to commodity production, try:
- Marx, 'Wages, Price and Profit' (short and sweet); and
- Capital, vol I, chapters 1–3 (comprising 'Part One: Commodities and Money'—well-known as the driest part of Capital but it's perhaps the most crucial part, too).
You’re very welcome, and I’m glad you’ve taken my comments in the spirit in which I wrote them. I wasn’t trying to be awkward and you are making some good points. I’m happy to keep talking if want to discuss the sources I suggested.
You might also really enjoy David Harvey’s Rebel Cities. He’s a geographer, so he engages with some of your ideas directly. He’s not arguing about human nature, but he takes this notion of profit and commodities and runs with it to see how it shapes cities and how cities shape capitalism.
The book introduces many concepts of historical materialism. It’s dialectical, but Harvey does not use much jargon. Okay, he uses some jargon, but he is good at explaining his terms and using examples. You can see this in the example quote below (at the end of this comment).
One aspect of the book you might like is his criticism of Marx’s concept of primitive accumulation. Harvey argues that a better term is ‘appropriation by dispossession’, which is an ongoing process. This has implications for how we understand modern capitalism, its origins, and its effects on human behaviour.
I read Harvey before any of the other texts cited in my previous comment, and although those other texts are complex, they were easier to read because I could fit the new ideas into the imagery that Harvey provides (he’s good at painting the picture). I also watched the first few videos in his lecture series on Capital, vol I before reading the text myself. These are on YouTube and were very helpful for me.
A quote that may pique your interest, from Harvey, Rebel Cities, p.5: