"earnings difference" is correct and can be used in written English
You might use it, for example, in a sentence such as: "The earnings difference between the two companies was striking."
The earnings difference between the films was greater abroad; Son of Sardaar earned $3 million overseas, and Jab Tak Hai Jaan earned more than $13 million.
They also criticised proposals to force firms to publish their pay ratio, which reflects the earnings difference between shopfloor workers and executives.
(In fact this greatly understates the earnings difference: it's just the difference between lifetime earnings for drop-outs and those with only a high-school degree.
Since you need to finish high school in order to go on to college, we should really be factoring in some part of the eventual earnings difference for those with college degrees or higher.
This amounts to 60percentt of the net earnings difference for workers without children and 67percentt for those with.
We estimate a series of earnings models to characterize the earnings difference between prefilers and non-prefilers.
Finally, the computation of standard errors for labor supply elasticity highlights the areas where male and female elasticity are significantly different, strengthening the case that monopsony differences relate to earnings differences for these workers.
Our empirical evidence firmly rejects the view that conscription entails relative long-term real earnings differences.
Source-country fixed effects did not contribute much to the earnings differences between CE and FE immigrants.
The overall patterns of earnings differences between CE and FE immigrant women were similar to those of men, with a few minor differences.
To test the relationship between job transitions and actual earnings differences, I estimate labor supply elasticities for males and females separately.
