You can hire a bar-admitted lawyer for $20/hour, yet some firms bill first year associates at almost $400/hour. The corporate service professions (law, finance, accounting, and consulting) have a self-regulating labor supply. A professional without hands on experience is not valuable to corporate clients, and hands on experience can only be acquired in the context of real litigation/deals/audits/etc. If demand grows, firms need to train and hire more people, and supply grows. I demand stops growing, as happened after the 2008 recession, firms cut back training and hiring to replacement levels, and supply stabilizes. That circumstance is unfortunate for the people who want jobs in corporate law/finance/accounting/consulting that can't get them, but limits the degree to which changes in demand affect the price of services.
