Cheap ECB loans push 3m Euribor, rate at which EZ banks can borrow from one another, to record low of -0.491%. Could fall to ECB depo rate at -0.5% as banks can always place excess cash w/ECB at this level. But true price for unsecured overnight cash is close to -0.55%, CBK says.#ECB# #ECB'sRateDecision# #Todayanalysis# #EconomicCalendar#