I for one would strongly prefer an economy with meaningful competition, instead of one where a certain group of economically privileged insiders organize a cart

I for one would strongly prefer an economy with meaningful competition, instead of one where a certain group of economically privileged insiders organize a cartel so that they can collude to fix prices and decide how much money to extract from the general populace which needs the goods and services they control... because you've basically just described what they call a "trust" when they make antitrust legislation. (Alternatively, you've described the National Industrial Recovery Act of 1933, later found unconstitutional - leading to FDR's infamous court-packing attempt - and considered by a little under half of economists to have been a major contributing factor which prolonged the Great Depression.) Getting more power to ordinary workers is laudable when it comes at the expense of the power of their large-corporation employers... not if it comes at the expense of everyone else in the economy.