Framing it this way is probably inaccurate, and if inaccurate, unhelpful.
From decades of observing the system, it seems extremely unlikely to me that it was deliberately engineered to be this way. Rather, different parts of it grew and changed organically and the parts and changes that benefitted moneyed interests in power stayed, while those that did not were discarded.
It does not take a deliberate will behind something for it to be pulled toward this sort of inequality, and presenting it as if that's what's happened suggests that if we could only defeat the Evil People who "engineered" it this way, we could make it better. It's a very compelling idea, and it makes for a nice dramatic narrative, and humans love good stories.
Unfortunately, it's not the case. In order to make it better, we need to take a good, comprehensive look at many aspects of our systems of economics and government, and redesign them deliberately and with a strong intention to inhibit the flow of money upward from the 99% to the 1%. It's hard, it will take a long time, the people with the most wealth and power will fight us every step of the way, and there's no silver bullet, but there's also very little that's more worth doing.