This has come up quite often on WMW; and according to "AdWords Advisor"; all bids are converted into USD (actually millionth's of US dollars) using an exchange rate that changes daily.
With regards to you not seeing a keyword fluctuate in and out of active status; I would imagine that the system has an element of change-damping to prevent just that occurring - in exactly the same way that the thermostat on your hot water tank doesn't go mad when the water temperature is fluctuating around the set temperature. Within that period of change; you no doubt have sufficient time to score enough quality points to avoid having the keyword disabled even if there is a more substantial drop.
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