system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what's gdp & what does it say about a country?

gross domestic product are words that i understand individually, but not necessarily together. 
i kind of assume it has to do with a richness of a country but i could be miles off. i wonder how many of us are on the same boat. 
either way, please enlighten me!
gpt
It is the total amount of everything that everyone working in a particular country produces.    Countries with higher GDP's tend to have stronger economies because they are producing more goods and services.