With less competition to fear, companies are emboldened to raise their mark-ups and profits. That lifts share prices and thus the wealth of already wealthy shareholders.
Entrepreneurs' willingness to innovate or just to invest - and thus create new jobs - is driven by their 'animal spirits,' as they decide whether to leap into the void.
If every effect of any new products or methods were required to be known before they could be produced and marketed, they would not be true innovations - and thus not represent new knowledge of what people would like, if offered.
Economists of a classical bent lay a large part of the decline of employment, and thus lagging output, to a contraction of labour supply.
The good life, as it is popularly conceived, typically involves acquiring mastery in one's work, thus gaining for oneself better terms - or means to rewards, whether material, like wealth, or nonmaterial - an experience we may call 'prospering.'