It is impossible to quantify how many affluent parents have trimmed allowances in recent months — or how many of their offspring, in turn, have sought either formal employment or odd jobs. But interviews with dozens of teenagers, parents, educators and employers suggest that many youngsters from well-to-do families seem to have found a new work ethic as the economic crisis that has pummeled their family stock portfolios and jeopardized their parents’ jobs has also led to less spending money for Saturday night movies or binges at Abercrombie & Fitch.Cry me a f'in river.