Hello, You know how interest rate is used in theory, say for synthetic arbitrage and the like? I was wondering, how EXACTLY does the money from your brokerage account gain interest rate? Is it from T-bills? Do you do this manually or how EXACTLY does this happen? Or say you early exercised stock puts and want to use the proceeds to accrue interest, as part of a complex strategy, how would one actually accomplish the part where you gain interest - do you take money out of the brokerage account, and then invest in T-bills? But won't this take too much time? Or does the brokerage have a service for this? It seems like interest rate is important to options, but not that much, but I am very confused as to the details of translating theory into practice. Thank you ^^