In a simple circular-flow diagram,why is total income equal to total expenditure?

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In a circular-flow diagram, total income is represented by the money that households receive from selling their labor and other factors of production, while total expenditure is represented by the money that households spend on goods and services produced by firms. Since every transaction involves a buyer and a seller, total income must be equal to total expenditure. This is because the money paid by buyers for goods and services ends up in the hands of firms, who then use that money to pay for the labor and other factors of production provided by households. Therefore, the total amount of money flowing from households to firms (i.e. total income) must be equal to the total amount of money flowing from firms to households (i.e. total expenditure).

In a Simple Circular-Flow Diagram,why Is Total Income Equal to Total