You may wonder, why can’t you use the previous swap cToken combo to do the same? The answer is because you have debts on Compound. Your cTokens are, therefore, collaterals, and they are locked until a) your debts are paid or b) you supply more funds to increase the collateralization ratio. The strategy below takes b option. We use flashloan to double your supply volume first and withdraw original collateral to pay back the flashloan. In this case, no upfront funds are needed.