Capital Accumulation
  
And the rich get richer. You have capital...maybe a small amount. Then you profitably sell gajillions of units of gahoozamorphs for 20 bucks each that cost you eight to make.
You pay some taxes and the cash builds up in your once-little company's balance sheet. The capital accumulates over time. And in this sense, it can accumulate as just cash profits piling on...or it can be on great investment in a stock that just goes up and never pays a dividend. Or it can be a leveraged buyout of real estate...aka buying your dream house with a mortgage and then watching its value (or the capital you put into it) increase. The basic idea is that capital keeps building up...it's accumulating.