You can't really just throw money at the demand side of the equation and expect everything else to stay the same. Supply side will raise their prices because they can (when everyone's got $10M in the bank, why not charge $50, $500 or even $5,000 for a loaf of artisan bread? And eventually other producers of bread follow suit because the consumer has become less price sensitive).
If you want to improve everyone's standard of living, what has repeatedly worked throughout history is to lower the cost of production through technology, and ensure there's lots of competition on the supply side. With enough competition, producers are unable to behave like a cartel. Eventually someone cracks and sacrifices part of their margin to attract more customers, and then a price war ensues. A textbook example is salt, which for most of human history was quite expensive, but after mechanized mining techniques were developed it became so cheap that for the average household it's practically free.
Technology + competition. At this moment in history we're quite good at the technology part of the equation but we have allowed many monopolies and oligopolies to form, so we're struggling at the competition part.