These calculators get the highest sales price and reach the highest volumes in cycles that build up around the beginning of September and January. This would naturally correlate with this being the time when new classes start in high school and college. This gives us insight into the Volume portion of the equation and when you can make the most money selling many listings for this item.

Many products on eBay have different demand profiles. There are certain times of the year when you can stock more inventory and expect to sell it, and other times when demand will begin to cool off. This is known as the product lifecycle, and knowledge of these patterns will enable you to make smarter inventory decisions and save costs associated with holding unused inventory and re-listing unsold auctions.

To do this we look at actual “closed listings’ figures to see averages for the product we are researching. You just enter the keywords that best describe the item to perform a search that will show you what the item’s average sale price is. You can even use minus keywords to help eliminate unwanted search results. In this case we used “TI-84 Texas Instruments Graphing Calculator -used”. This will help us only get items that are new.

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