Xiaohuang bought two kinds of stocks. Last year, all stocks increased by an average of 7 yuan per share, of which M company's shares increased by 10 yuan per share, and N company's shares increased by 6 yuan per share. Xiao Huang believes that the difference in value appreciation maybe just purchased When the average stock price of company M is higher than company N, it is assumed that the stock appreciation ratio is: the value-added per share divided by the purchase price per share. It follows from this:. ['Xiao Huang bought more shares of company M.', 'Xiao Huang bought more shares of company N.', "M company's stock appreciation ratio is higher.", "N company's stock appreciation ratio is higher."]