The major issue is that as the years go by, the average salary becomes insufficient because we are spending more and more time working for the government. Let's keep in mind that many first-world countries are being governed by socialist or similar ideas, where politicians need to keep the population ignorant and poor in order to manipulate them. All of these decisions come at a cost, and as time goes on, the state grows larger and the expenditure increases, leading to higher tax burdens, which are ultimately paid by the private sector.