Declining labor share is sometimes attributed to businesses underpaying workers. In fact, it is more due to a shift in the sorts of businesses that dominate the economy.

See The Big Money in Today’s Economy Is Going to Capital, Not Labor by Greg Ip. Excerpts:

"Declining labor share is sometimes attributed to businesses underpaying workers. In fact, it is more due to a shift in the sorts of businesses that dominate the economy. Today’s fastest-growing “superstar” companies pay well, but don’t have many workers. In the past three years Google parent Alphabet’s revenue has grown 43%, while head count has remained flat. Amazon is a major employer because of its fulfillment centers, but even it is eliminating jobs.

In such companies, the line between capital and labor blurs. Employees who design the technology are a form of human capital, and are compensated in stock to reflect that. Some corporate acquisitions dubbed “acquihires” are aimed primarily at talent, such as when Meta Platforms paid $14 billion for a stake in Scale AI to nab founder Alexandr Wang."

"Households’ stock wealth is now equal to almost 300% of their annual disposable income, compared with 200% in 2019. At such levels, wealth starts to rival wages as the driver of consumption, at least for the affluent households who own most stocks.

Doug Peta, a strategist with BCA Research, estimates that a 10% stock return, including dividends, taxed at the highest marginal rate, boosts spending capacity as much as an 18% rise in income. No wonder tepid job and income growth aren’t holding back the economy."