> What sort of transaction costs between people today are _practically_ the most important to leading to a creation of a firm?
Discovery of services (what can I help you with? what can you do for me) and trust (can I trust you to do task <x>? Can you trust me to pay you) are two of the biggest person to person transaction costs I see nowadays.
Yes. The transaction cost includes both trust for this transaction, and trust for future transactions. Supply chain issues are much more of a concern today than two years ago.
Discovery of services (what can I help you with? what can you do for me) and trust (can I trust you to do task <x>? Can you trust me to pay you) are two of the biggest person to person transaction costs I see nowadays.