many companies have entered the market so according to the competition theory, prices should go down
because many companies have entered the market, prices should go down according to the principles of competition
According to the principles of market competition, when new companies enter the market, prices should go down
「多くの会社の参入により、競争原理が働き、価格が下がる」＝ many companies have entered the market so according to the competition theory, prices should go down / because many companies have entered the market, prices should go down according to the principles of competition / According to the principles of market competition, when new companies enter the market, prices should go down
ボキャブラリー
多くの会社 ＝ many (new) companies
参入する＝ enter (the market)
競争原理 ＝ competition theory/principles of (market) competition
価格が下がる ＝ prices go down
イギリス 
