'growing discrepancy' is correct and usable in written English.
It is an idiom used to describe a situation in which the differences between two or more things become increasingly larger or more pronounced. For example: "The growing discrepancy between the rich and the poor in this city is causing serious unrest."
In a country as egalitarian as Sweden, that growing discrepancy alarms a lot of people, including the rich.
Support given to workers, especially those on the front line of humanitarian work, is regularly thought of as lax, and there is a growing discrepancy between senior pay and the rest.
When the Kovalchuk deal was announced Monday, the Web site for The Star-Ledger newspaper (NJ.com) ran side-by-side headlines that highlighted the growing discrepancy between the real world and the sports world.
In the most recent edition of Science magazine a group of Brazilian scientists warned there was a growing discrepancy between the positive role played by the country's diplomats at UN climate talks, and the increasingly destructive direction of legislation and infrastructure projects that do not adequately balance environmental and social costs with the economic benefits.
Hermione is angry and heartbroken at their churlish sneering, and Emma Watson's gutsy, confident performance nicely shows that inside and outside the world of magic there is a growing discrepancy between a teenage girl's status and her accelerating emotional and intellectual development.
However, the traditional idea of the "Franco-German motor essential to the advancement of Europe" is losing credibility with the growing discrepancy between the two economies, the widening differences in national interests, and the weakening of political will to build Europe together.
At a time of growing discrepancies in income between the poor and the rich, how would the public react to these revelations?
Amid growing discrepancies between the Kremlin's version of what happened at Beslan and the accounts of survivors and locals, people in the North Ossetian town prepared to send their remaining children back to school tomorrow.
According to this approach, words in ideal, past society incorporated the core of the realities denoted by them, while the crisis of the Warring States period (475 221 BC) emerged from the growing discrepancies between the names (social positions) of individuals and their actual behavior.
Substantial and growing discrepancies exist between what land uses are recognized by government institutions operating at different scales, with more support for forestry on the national scale and more for commercial agriculture at regional and local scales.
The discrepancy was growing with time in all 8 patients with sequential testing (figure 1).
