As far as the hard numbers are concerned, at one time in our history, and in some communities not all that long ago, men sometimes had more than one wife. And I do not recall any halachic responsa or literature expressing any concern that this was resulting in some men being unable to get married (since other men were marrying more than one girl, thus leaving insufficient girls for other unlucky men.) It would thus seem logical that there were always more girls in the shidduch supply than boys, throughout our history.
Menu