What is going to happen to HHA?
Will restarting my town cause the houses in HHA to disappear? I thought they might stay because these gamers are connected to your streetpass right? Or will that be wiped out too? It would be nice if I could get my furniture back once I deleted my save file. (after I unlock the HHA of course.)
Sorry for the bad English!
Going to happen to HHA
animal-crossing-new-leaf
Related Solutions
When buying turnips, the price can be between 90 and 110 Bells.
When selling turnips, things get a bit more complicated. Looking at some data points, it seems that sell prices can vary within a huge range, but will follow certain trends. These trends, along with other tips on selling, can be found here.
Decreasing Pattern 
In the decreasing price pattern, the prices will consistently decrease by a few bells each time, never increasing. With the decreasing pattern, the start price for the week will be between 99 and 50 bells. In this pattern, if the price doesn't increase by Thursday afternoon, you should sell immediately.
Big Spike Pattern 
The big spike pattern features a decreasing pattern, but then there will be three increasing prices, with the third being the maximum for the week, followed by two decreasing prices that are still higher than average, followed by a continuation of the overall decreasing pattern. The maximum price in this pattern is always preceded by two increasing prices and always followed by two decreasing prices, so the maximum can't occur on Monday or Saturday.
Small Spike Pattern 
The small spike pattern features a decreasing pattern, but then there will be four increasing prices, with the fourth being the maximum for the week, followed by a decreasing price that is higher than average, followed by a continuation of the overall decreasing pattern. The maximum price in this pattern is always preceded by three increasing prices and followed by one decreasing price, so the earliest that the maximum can occur is Tuesday afternoon and the latest is Saturday morning.
Random Price Pattern 
The random price pattern features unpredictable prices in the range of about 50 to 200. The prices increase and decrease at random. The price seems to go over 110 at least twice a week in the random pattern.
By learning these trends, you can determine which day will have the highest sell prices for the week. Prices change twice a day. Once when the shop opens and again at noon. In order to properly watch for the increases described above, you will have to check every new price.
Mail deliveries from HHA and the catalogue are at 9AM and 5PM. If your mailbox was full, you won't receive your items until the next scheduled delivery.
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Best Answer
The houses in the HHA disappear if you restart your game (I'm pretty sure that's the question you have, but... eh?) The houses aren't connected to Streetpass per se. You get their data via Streetpass and update it via Streetpass, but you would have to re-pass those people to see their houses again.
So the data from their houses gets wiped out with your reset. Streetpass itself is a 3DS concept, not an Animal Crossing one. So those people still be in your Mii Parade area, but their Animal Crossing data will be gone from the game.
You also can't get your furniture back through HHA, because you won't have your old save data (also, you can't buy your own stuff from the HHA, you'd have to buy it from the catalog in the general store because your house isn't in your HHA. If someone in your HHA has the same objects you do, you could buy it in the HHA... but you shouldn't because those items are priced with a 20% bell increase or something like that). Therefore, you can't use the HHA to get your old furniture back. You could trade your furniture to a friend and then trade it back after you've made a new file? But you can't get your stuff from the HHA.