Yeah, don't think too hard on it. None of that stuff effects the game besides infrastructure. Personally, I like a more diverse economy. Although I always choose corps that have low risk income( corps that make around 0.8 billion fully upgraded and may lose 0.2 billion when the market is green )from high risk income corps( corps that can make 2 billion a month but can also lose 3 billion a month ) Some examples of low risk are computers, household products, services. Some examples of high risk are Defense weapons maintenance and airforce maintenance. They're high risk because the materials cost a lot but you can make a very high profit if the product is in high demand. Although you will lose a lot if it goes green, which happens every so often when people flood the market to make some money quick. I made that mistake with def meapons maintenance. Look at the hall of fame players. They usually have a good setup. Weapons manufacturing is only good if you actually keep the weapons you produce. They usually don't make much profit if any at all. I wouldn't make many of them or any at all as it takes up workers. Try to only build industrial and high tech corps, some minerals like oil and potassium are okay too.