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We all have experienced congestion in the supermarket, because almost all the consumers "drive" big shopping carts walking in a limited space. "Zooming" is an adjustable shopping carts that is able to be enlarged and diminished.
The advantages of this design are as follows:
1. Relieve the crowding in supermarkets. Some people do not have to use big shopping carts when they buy a small amount of items.
2. Save transporting cost.Since the carts can be smaller.
3. Economize. Smaller sized mode can prevent people buying things endlessly.
Kang Yuan, He Siqian, Zhang Xi