Market Extra: A popular stock-market indicator flashes red as Dow soars to records Friday

An often-cited measure of stock valuations, popularized by Warren Buffett, is affirming a growing fear on Wall Street: equity prices are richer than their fundamental underpinnings.

An often-cited measure of stock valuations, popularized by Warren Buffett, is affirming a growing fear on Wall Street: equity prices are richer than their fundamental underpinnings.