Do women spend more than men?
Not reliably in personal income terms — but women direct a far larger share of total household spending than men do.
This question gets answered wrong because two different things get measured. Personal discretionary spending tracks closely with personal income, and the gender pay gap means men still hold more of it individually. Household spending is a different measurement entirely: it is recorded at the consumer-unit level, and in most households a woman is the buyer of record. She is purchasing for people whose income is not hers. That is why 'who earns more' and 'who spends more' produce opposite answers, and why brands that plan against earnings data consistently under-target the person actually at checkout.
Source · Bridget Brennan, Why She Buys (widely-cited industry estimate)