[[[ForeverAlone]]]

In Economics business , This is Unfair trade.

We pay for service , beside foods now need to return tray
Already unfair in term of " trade "

Look Operators hire cleaners, they pay their wages in return they also include high rental charges
Hawker on the other hand increase price due to high rental , cleaners , of course supply price increase

All these charges in return we customer pay, aka means we pay also their wages and profit in return to get the service we want.