Anderson $($A$)$ agrees to sell Wal$-$Smart $($WS$)5,000$ bicycles.

Prior to the A$-$WS contract, A contracted with

BicycleManufacturer $($BM$),$ to supply him with $5,000$ bicycles.

BM halts production and cannot produce all the Bicycles for $A.$

In this case, A may be discharged by $q,$ since the means of performance contemplated in the contract cannot be performed.

frustration of purpose

commercial impracticability

force majeure

impossibility