How a shortage of men could reshape marriage
War can change more than a population’s size: it can change who is available to marry. If many men die while more women survive, the pool of potential husbands shrinks relative to the pool of potential wives. That shift can give surviving men more choice and weaken women’s ability to insist on an exclusive marriage—especially where social rules already allow a husband to take more than one wife.
The economic mechanism is a change in bargaining power. When potential spouses are scarce, the side in shorter supply can often set more of the terms. A man able to support multiple households might marry again, while women and their families face stronger pressure to accept arrangements they would have had less reason to accept when men were plentiful. Polygyny—the form of polygamy in which one man has multiple wives—is the relevant pattern in this account.
Why the population imbalance was not enough
A lopsided sex ratio did not automatically produce polygyny. Marriage customs and law had to permit it, and a man needed the resources to maintain more than one household. The consequences also depended on who survived and what happened to widows, children, and family property. In some settings, remarriage could provide material support; in others, the same arrangement could concentrate choice and resources in men’s hands.
The important point is that war could alter the terms on which marriage was negotiated, not simply leave more women without partners. A demographic shock could become an economic one when customary rules let the scarcer group turn its advantage into control over marriage choices.
