TLDR: https://en.wikipedia.org/wiki/Transaction_cost https://en.wikipedia.org/wiki/Transaction_cost The transaction costs of small transactions quickly overwhe

TLDR: https://en.wikipedia.org/wiki/Transaction_cost https://en.wikipedia.org/wiki/Transaction_cost The transaction costs of small transactions quickly overwhelm the value of the transaction. This gives rise to market structure included (especially) the firm and the bundling within of non-market transactions. https://en.wikipedia.org/wiki/Theory_of_the_firm https://en.wikipedia.org/wiki/Theory_of_the_firm