 በሁለቱም የቴክኒካዊ እና መሠረታዊ ትንተናዎች መፈተሸ ላይ "ግብይት-ገበያ መላምቶች" ተብሎ የሚታወቀው, የገበያ ዋጋዎች ሊተነበቡ የማይችሉ መሆናቸውን ይገልጻል.
The efficacy of both technical and fundamental analysis is disputed by efficient-market hypothesis which states that stock market prices are essentially unpredictable.