How do you determine sales (demand) plateau vs. sales (manufacturing capacity or brand loyalty having customers wait for their brand to ship) plateau vs. model

How do you determine sales (demand) plateau vs. sales (manufacturing capacity or brand loyalty having customers wait for their brand to ship) plateau vs. model availability plateau (i.e. no electric truck is shipping today, no fullsize SUV, no minivan, etc.)? TCO my math has EV better than ICE already even in the US with lower fuel prices and typically higher mileage per day than EU.