Complex sentence: Mises (1920) suggested that socialist officials could simulate pricing in spot market, but the trial-and-error proposal is irrelevant to the real problem of planning investment, because inventories of "future" goods never exist.
Split into simpler sentences: Mises (1920) suggested that socialist officials could simulate pricing in spot market. The trial and error proposal is irrelevant to the real problem of planning investment because inventories of "future" goods never exist.