Today we hear a lot about economic and social justice. There seems to always be talk of raising the minimum wage in order to have it keep up with inflation. We hear about the great wealth divide where the gap between wealthy and poor widens. This is spoken as if there is a limited numbers of dollars and if one person gets wealthy they must be taking it from someone at the bottom. This is a fallacy.
Today we have a global market. There is massive trade between countries. Goods and services are exchanged between countries. I could give you the total global accumulated wealth, but that changes daily. The amount of a country's currency changes daily. The USA is creating $84 billion a month. This doesn't include dollars created out of thin air that is loaned to banks. Even if that currency is temporary, it becomes temporally a part of total currency. Gold and other commodities are converted to cash through Rehypothification in the form of bonds.
Each day wealth is taken and returned to the government. Currently the death tax (estate tax) is 40% of assets above $5.5 million. When the government takes that money it's often returned to the economy in various ways. Eventually that money becomes available to be earned once more. To be sure, this isn't in support of the death tax, but just an explanation of how currency moves. This does show, especially under the current taxing system, rich cannot accumulate wealth to the point that the poor can have no chance of moving to the middle class.
Death isn't the only way that wealth trickles down to the poor. Much of the wealth lies with business – be it small or large. Most businesses are always looking to expand. They will spend money on building facilities in which to produce more products or services. When expansion happens more workers are hired. Careful thought is given to the number of employees needed. In order to make that decision they must look to see how much of their budget can be set aside for labor. They then look at the labor market and decide what is the lowest wage that can be offered and attract the necessary labor. Skilled labor always comes at a premium, while manual labor is usually easier to find.