A young couple living in rural west-central Missouri heard about the closing of a local grocery store. Although a small operation, it served a small community that would now have to travel another 20 miles to the nearest grocery store. With help from a local realtor and banker, the couple purchased the store, remodeled it, and reopened it. As new store owners, they had to carefully watch cash flow. As their customer base began to grow, they began offering hot food, and hired others to help with the operation. The economic benefit created in this story is called

As new store owners, they had to carefully watch cash flow. As their customer base began to grow, they began offering hot food, and hired others to help with the operation. The economic benefit created in this story is called An Invisible Hand

Explanation:

Invisible hand refers to an economic term that is  used to describe the unexpected benefits of a business venture which was started with the sole purpose of self benefit but later on that benefit is also enjoyed by the community as a whole

This  clearly states the economic  benefit which was unexpected in the business.

In the given Scenario  also, the couple occupied the business but, the benefits were completely unexpected and the growth rate was  also high as related to   investment made.

Thus, the correct phrase for such situation is:Invisible Hand

answer; comparing the additional benefits and costs;