EVERY WEEK, a new high. Little wonder a sense of unease is settling over markets. Some 40% of global fund managers think that artificial-intelligence (AI) stocks—a crucial driver of the rally—are already in a bubble, according to Bank of America’s latest monthly survey. Even Wall Street’s most starry-eyed pundits reckon America’s S&P 500 index of leading shares can eke out only minor gains in the remaining nine months of the year. For some, such nervousness portends a crash. But for everyone, it prompts a question: with stock prices having already risen so much, are there any left that offer good value?