If bitcoin deflates and the price rises...
What do people mean by "deflation" and "inflation"? These terms are abused without limit. Some say, inflation is "increase in money supply" (therefore, deflation must be the opposite). Others say inflation is "when prices rise". What does it mean "bitcoin deflates and prices rise". Bitcoin cannot deflate in terms of contracting the money supply. The money supply is either fixed or slowly growing (however you see it), lost coins affect everyone by 0.001% which is negligible. So if you say that "bitcoin deflates" means "price of BTC is rising", then why adding "and its price rises"?
In my opinion, the terms inflation/deflation are highly abused. The sound of these words suggests someone's control over the total supply. This is not the case with gold and BTC, but it is the case in fiat currencies. Gold can be lost and mined, but these two things are highly limited by the natural laws (e.g. people will tend to increase security of their gold to avoid losing it even more and miners will try hard to mine more, but it's limited by the total amount of gold on the earth that is technologically accessible).
I myself try not to use "inflation/deflation", but use "increase/decrease" in supply. In case of gold and BTC, this increase and decrease is highly limited and outside of anyone's control. Even you there is a single miner on the planet, his supply will still be no different from the supply of 1000 miners. Also, BTC supply does not really increase because everyone knows the future total amount. And even miners cannot know who exactly will earn it. We just know that given the diversity of miners, we can expect that the new money will be very likely to be spread in many different areas in the economy without creating disturbance in price structure. And even if the miners are not diverse, we can account for that risk, knowing how much hashing power is centralized. The more centralized - the more unstable the prices will be. But that's up to entrepreneurs to calculate.
So, Bitcoin total supply is constant, known in advance, price structure is not expected to be disturbed by the increase of supply. If more people demand Bitcoin comparing to people willing to sell it, its price will naturally rise. Will it create a "deflationary spiral"? Of course. But only up to the point of balance, when someone is willing to sell at a higher price. And what if no one wants to sell, but everybody wants to buy even more? Well, then no trade will occur. Does it mean total collapse? Of course, not. It only means that everyone got what they wanted.
Imagine an auction where unique paintings are sold. Everybody bought all the paintings and not selling them. Is there a market price for them? No, because nobody is willing to sell for any price. Do paintings lose any of their value? No, because their owners are very happy to keep them. In case of currency, this will only happen if you only have 10 satoshis left (while the rest is destroyed) and people simply collect them.
Now imagine, that some people only purchase BTC in expectation of quick rise. So everybody was buying until nobody sells more. So those speculators wait, wait, wait and see that no trade is happening at a higher price. Only some people exchange at some stable price, say $40. Now these speculators see that they don't want their coins anymore and rush to sell before their competitors do the same. The price naturally goes down to the point at which longer-term investors are willing to buy.
And the last point: the money does not "circulate".
http://blog.oleganza.com/post/43378777734/on-circulation-of-money