The saving happened when he made the product but didn't consume it himself, not when he sold it.
I suppose in a market-based economy, everything produced is for sell and exchange for money. And most of the things produced will be vanished/degraded quickly (compare to money). For most of the product, if you produce it and store it, it will lose value quickly, no matter if it is consumed, this is the issential difference of saving goods and saving money. If more products are produced and consumed everyday, the economy is stronger
Of course people can produce something just for the purpose of store, like gold, but the incentive is really small if most of people's life is enough secure and comfortable