Wages have fallen to a record low as a share of America’s gross domestic product. Until 1975, wages nearly always accounted for more than 50 percent of the nation’s G.D.P., but last year wages fell to a record low of 43.5 percent. Since 2001, when the wage share was 49 percent, there has been a steep slide...

For the great bulk of workers, labor’s shrinking share is even worse than the statistics show, when one considers that a sizable — and growing — chunk of overall wages goes to the top 1 percent: senior corporate executives, Wall Street professionals, Hollywood stars, pop singers and professional athletes. The share of wages going to the top 1 percent climbed to 12.9 percent in 2010, from 7.3 percent in 1979.

Some economists say it is wrong to look at just wages because other aspects of employee compensation, notably health costs, have risen. But overall employee compensation — including health and retirement benefits — has also slipped badly, falling to its lowest share of national income in more than 50 years while corporate profits have climbed to their highest share over that time.

Conservative and liberal economists agree on many of the forces that have driven the wage share down. Corporate America’s push to outsource jobs — whether call-center jobs to India or factory jobs to China — has fattened corporate earnings, while holding down wages at home. New technologies have raised productivity and profits, while enabling companies to shed workers and slice payroll. Computers have replaced workers who tabulated numbers; robots have pushed aside many factory workers.