Hi dear i need a expert tutor answer me current economic

Please write clearly Information and explanation with professional skill

I am confuse Why covid virus affect the economics so bad

First Question

I am from Malaysia

Most of the shop example (bubble tea shop) shut down and closed down

Why the shop closed down ? Yes i know because they dont have business dude to covid virus but i am confuse why must shut down the store ? is it because of rental fee

Second Question

I saw the thailand news about thailand airline apply for bankruptcy

How is it possible this happen its a huge airline

Third Question

What if the covid virus is getting bad and bad untill 2022

whats the worst things will happen in world economic ?