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Repo Cases in Indonesian Stocks

According to Investopedia, the repurchase agreement, or repo, is an agreement between two parties in which the first party borrows some funds from the second party with certain securities as collaterals, such as stocks, bonds, or government securities, with the promise that the first party would buy back the collaterals (thus the second party will get their money back). Usually the value of the loan is lower than the value of the collateral, for example A borrows Rp100,000,000 from B with 100,000 shares of X as collateral, at a price of Rp1,000 per share (so the loan value is Rp100 million), while the stock price of X in the market was higher at Rp1,500. In theory, if A later can not repay the debt, then B could just sell the shares of X that he holds in the market, so he will still make 50% profit.