After doing a course in online trading, Harsh started an online portal for stock trading under the name 'Global investment'. He met his school friend Suresh after a long time in a bank where Suresh had come to open a D-Mat account. Harsh urged Suresh to invest in the forthcoming IPO of a blue-chip company whereas Suresh was inclined to buy existing securities of the other companies to build his investment portfolio. Which kind of capital markets are quoted in the above paragraph? Can you explain 3 differences between both the capital markets?