How do you think is it important what is the we gonna look this words in explanation like this first stock second trading third is prices what is stock is where any person,firm,and government put their materials,furniture,merchandises etc and also trading is any activities of buy and sell goods,cars,shares,bonds,currency,stock ,cash,options etc.. prices is any value of same thing as types above stock trading prices are values of market exchange any trader can make in give him or her the profit for example,if any certain company hold stock of 32.5 and then will sell at 42 means the profit is 9.5 and we will look prices on purchase options and sell options let us look about 32.5 as buying prices and 42 is selling prices Старый Оскол, Russian Federation?