People say this all the time without presenting any evidence, as if it is common sense. I don’t actually think this is correct! Of course the character of investment would change. Instead of a small number of large investments, we would see a large number of smaller investments. If your competition is churning out some widget and you can make a $10,000 investment in your factory to lower your production costs below theirs and out compete them, you will make that investment.
My point is that I believe in this case, natural market mechanisms are adequate to stimulate investment. Meanwhile proponents of patents must justify the enormous cost to society caused by heavily restricting innovation with legal penalties, building a 20 year moat around every new invention. That massively hampers incremental process, and raises the cost required for investments to succeed. Without patents, smaller incremental investments will pay off, but there will be much more competition. Unless you think markets cannot function without the massive government intervention which is intellectual property restrictions.
And heck don’t take my word for it. The folks at the free market Mises Institute hate IP restrictions: