It never ceases to amaze me how two jobs with similar job descriptions and similar educational and experience requirements can pay so drastically different – the only difference being the one job offering full time hours and the other part time.
For example, in the field of digital marketing, there are many full time jobs advertised on indeed between $60-80k per year – that's $30-40 an hour. But take that same job and make it part-time hours, and the job is now only worth $20-25 an hour. It is near impossible to see any part time jobs in this field for over $30 an hour.
So far as I see it, a part-timer is going to give just as much value as a full-time employee (I could argue even more because we want to get our job done quickly so we stay in part-time hours, so we try not to engage in the usual office banter – we've all seen the stories about how productivity goes up for companies that choose a 30 hour work-week). Being part-time also means that employers don't need to provide us benefits, another cost savings. If anything, you'd think we'd be paid more, not less.