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What about a doubling of the current inventory within 12 months screams "hot market" to you? How does that NOT give you insight to what is going on?
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I can think of a couple possibilities.
1) As I learned in a real estate class, inventory levels are a lagging indicator which may not signal drops in prices for YEARS. If sellers can sell for the same price by waiting an extra month or two, many of them generally will.
2) As you can see from the above relying on any single indicator to call the direction of the market is a bad idea. What if your example of a 2x increase in inventory was due to a record heat wave in dallas? Will that apply to the future? (it might)
Probably the easiest way would be to look at census data showing the net growth or decline in regions. Communities that are growing and have people moving into the city would be a good opportunity for flipping. On the flip side, communities that are showing negative growth would probably not be a good investment.
This is a good start but it is too general and ignore many other indicators that could give someone a competitive edge. That is why I take this subject seriously.
Find some target markets, then look to each community to find out why the growth is going on.
This is like saying "find a strong stock, and then figure out why it's going up" Wouldn't it be a good idea to learn what factors go into the pricing of that stock before I throw my rationale at it (which BTW is why many people fail at stock investing)
Now I know RE is less volatile and easier to predict than stocks, but I still want to approach it as I would any other investment and that is to learn as much as I can before I make any novice decisions with my money.
I was holding out for a better reference, but I guess I'll check out a market analysis book that's at my library (copyright 1988!)