Here are three things you should consider implementing.
1. Build in cues of product redundancy
If you have a perishable product, most of your work will be taken care of by nature and health standards. "Use By" and "Best Before" dates are examples of cues that are designed to protect the health of the consumer.
But what if your product's life cycle is not so obvious?

So the question for you is whether your product has a life cycle, real or perceived, that you can highlight to your customers?
2. Activate re-purchase by providing a cue
Smart manufacturers give their consumers advanced warning of the need to take action. Examples include;
- Tissues that change grade and colour as you near the bottom. You know when your white tissue turns pink and scratchy that the good times are over.
- Rolls of cling wrap that include a reminder sticker to buy more when you near the end of the reel
- Car dashboards that signal when your service is due
The lesson here is that you can help your customer avoid running out of your product by providing them explicit cues.
3. Make the cue transportable
It's great that you have created a need to re-purchase through redundancy and triggered the need to re-purchase, but there's still a long way to go between home and the cash register. You need to help your buyer be reminded to buy your product in the context of purchase.
For example, ever had the experience of being out and enjoying a bottle of wine so much that you sometime later look for it in the bottle shop? If only you can remember what it was called! Clever wine makers have closed this gap by providing a transportable cue in the form of a perforated, take-away tag on the wine label so that the customer can rip it off and keep it handy for their bottle shop hunt.
QR codes can likewise be used to close the gap between product use and repurchase...if only anyone used them. But code scanning technology aside, mobile phones are definitely the key linkage between home and the retailer because they are with your customer in most contexts and used as a source of information and reminder.
The question you should be asking yourself here is how are you physically helping to remind your buyer to buy your product?
Repeat purchase is something that businesses hope for but often don't invest enough time and thought into. Challenge yourself to look at how you can cue the need for re-purchase and you might be pleasantly surprised at the influence you can have over your buyer's cycle.
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Images
Best before image: http://www.ers-online.co.uk/files/products/options/images/3879_26x12%20best%20before.jpg
Tontine pillow: http://cdn.mumbrella.com.au/2010/10/tontine-pillow-350x185.jpg
Wine label: http://themarketingguy.files.wordpress.com/2010/06/wine-label-1.jpg
Tontine pillow: http://cdn.mumbrella.com.au/2010/10/tontine-pillow-350x185.jpg
Wine label: http://themarketingguy.files.wordpress.com/2010/06/wine-label-1.jpg