2x-5y+7z=6,x-3y+4z=3,3x-8y+11z=11 solve using gauss jordan method​

In north korea, a farmer’s income is the same as a dentist’s income. in a country with a mixed or market economy, the difference between those two professions might be more than 5 times different. how can you explain the fact that individuals doing the same work in different countries do not earn comparable salaries?