:marx-joker:

Because the only things of value are social product and a machine cannot create social product, only consume and convert it to another form. Arbitrage during moments of innovation and market change can lead to the creation of commodities with a higher price than their actual value, but the value still comes from the labor put into both the dead labor/means of production (machines and fractional products) and living labor that created the commodity.

Basically, bubbles keep forming and bursting because capitalism is incapable of reconsiling the contradictions that lead to the arbitrage that destroys the economy. The economy only functions smoothly when commodities have a price equal to their value and crashes when insane stuff happens that totally changes the relationship between price and value leading to massive accumulation of currency by the owners and stagnation of wages for the workers.

This wouldn't matter if most of the people on earth weren't proletarians and their subsistence came from social production and instead came from subsistence farming or some sort of feudal arrangement, but alas, that is not the case and now someone inventing an app that changes the division of labor in the transportation industry has ripple effects through the entire economy leading to collapse and crisis.

(Also, always remember that price and value are very different things! Price is just an attempt to represent labor value by means of another commodity which in turn is defined by its own labor value. This contradiction is the primary one used to suppress wages and increase the rate of profit/surplus value generation. Your work has a true value and you are given a portion of it in wages/the price of your labor while your employer gets to keep the rest)