wt is minimum supply price of comodity?

Minimum price refers to AVC (average variable cost) because a producer will only sell its goods till the shut down piont (point at which AVC touches AR) because below AR a firm has its frofit if AVC so he produce and sell more units and if AVC minimum is above AR so producer can not continue due to heavy losses but when AVC minimum touch AR so Atleast he is covering his average variable cost so he will produce that level of units.