1.
a. Due to the dictator system of the worker's party, citizens do not get enough to eat, partially due to the fact that the country is poor and cannot properly sustain itself, as well as the fact that the country has a ton of sanctions and can't import and export many things.
b. After the Soviet Union collapsed, North Korea stopped getting help from the nation, causing widespread famines. This eventually caused the life expectancy to drop by a lot. The communism system unevitably causes famines, but I won't talk about the communist systems here.
2.
At night, South Korea is seen as a bright star with a lot of electricity. However, North Korea doesn't have much of this. This is because North Korea is significantly poorer, due to the Worker's Party system and other factors, and this is why only rich cities which house the top elites have electricity. The people in the countryside working in farms are horribly poor.
3.
When the Soviets took the north of Korea, and NATO took the south, very different systems were implemented, and as North Korean dictators slowly shifted away from democracy and into a monarchy-like suppressive system, North Korea became poorer and poorer as the leaders became a lot richer.
The answer is, "Sugarcane".
Companies like Uber and Airbnb uses this kind of economic model. For Uber Taxi, unlike the traditional taxis that are owned by companies, the customers/passengers are serviced by private drivers who owned the cars used. For Airbnb, it allows customers/vacationers to rent a place or a room owned by private individuals compared to hotels or resorts which are owned by companies or corporations.
