In macroeconomics, an open market activity (OMO) is a movement by a national bank to gi take) liquidity in its money to (or from) a bank or a gathering of banks. The national bank ca trade government securities (or other monetary resources) in the open market (this is the where the name was generally gotten from) or, in what the future held favored arrangeme a repo or protected loaning exchange with a business bank: the national bank gives the cas store for a characterized period and simultaneously accepts a qualified resource as insuran