Transaction costs include all the costs associated with executing and governing a transaction. Since formal financial transactions are recorded in writing, and written records are the principal source of evidence in the case of disputes, people who can't read or write will avoid formal finance unless they receive their money first (as in the case of a loan, or a cash withdrawal).

"A governance structure is usefully thought of ... as an institutional framework in which the integrity of a transaction, or related set of transactions, is decided." [Oliver E Williamson]

When transactions fail to attain integrity, in the sense of a common agreement between the buyer and sell, markets fail. And in the case of microfinance, this means financial exclusion.

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