Why is prize money unequal between men's and women's sport?
Because prize money is generally set by each competition's own revenue and commercial position, not by a central authority applying a single standard — so equality has had to be achieved competition by competition, and progress has been correspondingly uneven.
Where it is already equal. Tennis is the clearest case: all four Grand Slams now award equal prize money, achieved over three decades and completed in 2007. Athletics, several major marathons, surfing, cricket's world events and a growing list of others have also equalised.
Where large gaps remain, most visibly in football, where the prize funds distributed for the men's and women's World Cups have differed by a very large multiple, and in golf.
The arguments made for the gap:
Revenue. Competitions distribute what they generate, and the men's events currently generate more from broadcast, sponsorship and gate.
Audience size, which drives that revenue.
Commercial history, with men's competitions having decades of accumulated investment.
The arguments against, which are substantive:
Revenue is partly a consequence of investment, not merely a cause of it. Women's competitions were for long periods actively banned or unsupported — English football banned women from affiliated grounds for half a century — and comparing current revenue treats the result of that exclusion as a neutral fact.
Growth rates are high where investment has been made, and audiences have repeatedly exceeded projections.
Scheduling, promotion and broadcast slots are allocated decisions that shape the revenue then cited to justify them.
Bundled rights historically sold women's competitions cheaply alongside men's, understating their value.
Some prize funds are set by federations from overall revenue rather than by event, which makes the split a policy choice rather than an accounting outcome.
Where the debate has moved. Away from arguing about whether revenue justifies the gap and toward guaranteed minimum investment, equal conditions and separate rights sales — since the last of those is what allows the value to be measured at all.
Equal pay for national team players is a separate question from prize money, settled in several countries by agreement or litigation.