Are assistants supposed to make more money than their manager?

I have been working in an office for a little pve a year now. The manger quit a month after I started. I asked for her position and was denied. They hired another manager that despite the fact that she showed up hungover and couldn't stay at work 1/2 the time due to daily drama and pills, they paid her 16-16.50 an hour. She was there for about 8 months before they let her go. I was given her position for $4 less an hour. My assistant stayed for 5 months and took another job elsewhere. She was begged to stay and offered $1 more an hour plus her gas to work. She declined knowing they are trash. My new assistant that only has 1 more year of experience and is bilingual is starting this week making the same as I do or a quarter more. Am I delusional or is this really wrong?! I want opinions and answers. What can I do about this?