Of course, the functionaries in a late 18th century/early 19th Century workhouse were anything but “rich”, let alone super-rich.
And during that era, a free market was far from the real situation. Government bestowed patents to do business, and one had to have one or risk jail. Not surprisingly, government played favorites. It was “crony capitalism” at its very worst, and the antithesis of a free market.
The movie (and novel upon which it was based) is set in England. And, the very system of government control of opportunity and government-bestowed privilege was one of the main reasons why the American colonies revolted. Because the British government was hampered in its ability to control and regulate commerce in America, the general prosperity in the colonies was far greater on a per capita basis than it was in England at the time. Colonial America, in fact, had the highest per capita wealth in the world at the time. British threats to that freedom incited the Revolution.
And, of course, “trickle down” is a meaningless term in an economic sense. It’s just a sarcastic term coined by the left to defame one president’s tax reductions in the absence of a persuasive reason to oppose them.