system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5 Why unemployment in developed countries is an issue?

I can understand why in undeveloped ones, but doesn't unemployment in a developed country mean "everything is covered we literally can't find a job for you."?

Shouldn't a developed country that indeed can't find jobs for its citizen also have the productivity to feed even the unemployed? is the problem just countries not having a system like universal basic income or is there something else going on here?
gpt
A big thing to remember is that unemployment very specifically means people who aren't working now, but want to be working. To a certain degree, unemployment is a good thing. The most common type of unemployment in a developed country is supposed to be frictional unemployment, that is someone who is unemployed because they are in the process of changing to a new job or are entering the work force for the first time. Having this at a reasonable level is important because too little means the people have given up hope on becoming employed and too much means many people have all quit their jobs all at once, neither of which are good signs. 

The other types of unemployment represent problems in society, such as structural unemployment wherein people are unemployed because while jobs are available, they aren't in the right place. Unemployment of this type is a large driver of poverty in developed countries, most commonly due to formerly strong manufacturing bases have moved elsewhere in the world and left the workers behind - it's not that there aren't jobs to be filled, it's that there is a mismatch between the skills people have and the jobs that are available to be filled. It is not unheard of for formerly major cities to have all but completely died because their jobs have moved to a different location, leaving behind a collection of workers specialized in making something that is unneeded or is more easily traded for.   This forces people to have to either restart their education from scratch or move to a place that is hiring. When applied to a national level, that is a big problem.