Answer:
It is either Technology or natural resources.
Step-by-step explanation:
Each day, our technology grows. With that, our economy grow too. During the Industrial Revolution, people invent new ways to improve our society. Natural Resources. They help our economy buy producing things that we need. For an example, oil. Oil helps us everyday in life, from filling up our gas tanks to controlling power for our factories. Sorry, if this wasn't much help, but I think it's either Tech. or Resources. It's up to you to think what's more reasonable. Have a great day.