If gender is a social construct, how can there be a gender wage gap?

Money is also a social construct and not everyone is equally wealthy.

"If gender is a social construct, how can there be a gender wage gap?"

The gender wage gap is also a social construct <lol>.  Actually, the gender wage gap is a feminist construct.  Here is the reality in the US (with similar legislation in every first world county, and beyond).  The Equal Pay Act:

https://www.eeoc.gov/statutes/equal-pay-act-1963

Clearly, the Pay Equality we have under the Equal Pay Act is not good enough for feminists for some reason.  They seem to expect all women as a group to earn the same as all men as a group do as they always reference average earnings statistics.  And when that obviously doesn't happen, they make it out as if it's some kind of problem at the individual level for any and all women.  And there is your falsely constructed issue right there.

.

1) It's sex-based not gender based

2) social constructs are cultural ideas that still affect how people act

No-matter-what-you-call-it,-men-earn-more-money-than-women-for-comparable-jobs.