The problem with shopping carts is that it is very bumpy and un-shock absorbent, expensive and stiff frame, easily lost, hard to control, and never the right height.
To solve these problems, I've decided to add rubber ends on the edges of the cart, suspensions on all wheels, an aluminum frame, PVC webbing around the cart, electromagnetic bottom so carts stick together, omni wheels on the back wheels, and an adjustable push bar.
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