Xerox PARC in the 70s and early 80s had a head start on inventing the personal computer revolution. PARC was well-funded, and they spent a fair amount of money building computers so each researcher had one on their desk. A little later, PCs were made in such quantity that it was no longer possible to stay ahead and have better equipment than businesses and consumers could buy. At PARC, they invented ethernet, the desktop metaphor, WYSIWYG editing, and much else. they didn’t invent the mouse, but they built platforms and environments that made really great use of it.