functional distribution of income

Whenever something is produced and sold, the money it earns gets split up among everyone who helped make it. The functional distribution of income asks a simple but profound question about that split: not who gets the money, but what gets the money — how the total income of an economy is divided among the broad functions, or factors, that created it. It carves the national pie by the type of contribution, not by the names of people.

Traditionally the slices match the factors of production. Labour earns wages and salaries (the labour share). Capital earns interest, dividends, and retained profits (the capital share). Land earns rent. Entrepreneurship earns profit. In a modern economy, the headline figures are usually the labour share and the capital share — for example, an economy where workers collectively receive about 60 percent of national income and owners of capital receive about 40 percent. These shares are not fixed by nature; they shift over decades with technology, bargaining power, globalisation, and policy.

This concept is the bridge between how production works and how unequal a society is. The functional distribution (between labour and capital as a whole) shapes the personal distribution (between rich and poor people), because the wealthy tend to own a far larger share of capital while most households rely on wages. A widely-noted trend in many countries since around 1980 is a falling labour share — a smaller slice of the pie going to wages and a larger slice to capital — which is a leading suspect behind rising inequality. The honest caveats: measuring the shares is surprisingly tricky (where do the self-employed, or executive pay, belong?), and the causes of the shift are still debated.