Price deflation occurred after all major busts up until the Great Depression (it happened during good economic times too, however), which led many economists and policymakers to believe that price deflation is bad for the economy (the rationalization is something along the lines of: if people expect prices to go down, no one will buy anything since it's cheaper in the future, therefore trade and wealth diminishes. Yeah, it's kinda odd). That's why the FED since the 70s (or something like that) has had as one of its missions to keep the CPI at around 3% annual increase by expanding the monetary base, so that decreasing prices are safely avoided.
If the quantity of money were stable or falling while the amount of consumption goods increased, all else equal, the price of goods in terms of money would decrease.