Loyalty programs are a great way to incentivise repeat business and encourage customers to keep coming back. Some examples of effective loyalty programs include:

1. Starbucks Rewards: Starbucks Rewards is a widely successful loyalty program that rewards customers with stars for every purchase they make, which can then be redeemed for free drinks and food items. Customers also get access to exclusive offers and discounts.
2. Sephora Beauty Insider: The Sephora Beauty Insider loyalty program rewards customers for their purchases with points that can be used for discounts and free products. They also have different membership levels, and depending on the level, members get access to special services and experiences.
3. Amazon Prime: Amazon Prime is a subscription-based program that provides customers with free two-day shipping, as well as access to a wide range of digital services such as streaming music, movies, and TV shows.
4. Target Circle: Target Circle rewards customers for their purchases with cash back and exclusive discounts, and it also allows customers to vote on community giving initiatives, connecting customers to the local communities.
5. The Nordstrom Note: This loyalty program rewards customers with points for purchases that can be redeemed for store credit. It also offers exclusive access to sales and events, as well as free personal styling services.
6. Airline loyalty programs: airline loyalty programs such as frequent flyer programs, reward customers for their purchases with miles that can be used for free flights, upgrades and access to exclusive lounges.

These are just a few examples of loyalty programs that have been successful in incentivising repeat business and building customer loyalty. A good loyalty program should offer rewards that are valuable to customers, be easy to understand and use, and have a clear value proposition. It should also be accessible and have clear communication channels so customers always know how to redeem their rewards and track their progress. Additionally, they should be able to capture valuable data that can be used to personalize the customer experience and offer tailored incentives to keep customers engaged.