You earn commission on anybody’s purchase, except yours, if they use your referral link within 24 hours. One tip here is that you can trade referral links with family members and friends and use their link to make your own purchases and ask them to do the same so there can be sharing of the spoils. This might not be the major way to make money in the affiliate program Amazon runs, but it can help your commission structure.
Also, remember that you are able to receive a commissions on anything your referral purchases over a 24hr period. So, even if you refer someone to purchase an e-book but they also end up buying $400 worth of other stuff, you get a commission on that, too. So really, you’re playing a numbers game here, especially around the holidays. This is why the Amazon Associates affiliate program is so powerful. When people by from Amazon, they tend to load up that cart.
There are two ways to approach affiliate marketing: You can offer an affiliate program to others or you can sign up to be another business's affiliate. As the business driving an affiliate program, you'll pay your affiliates a commission fee for every lead or sale they drive to your website. Your main goal should be to find affiliates who'll reach untapped markets. For example, a company with an e-zine may make a good affiliate because its subscribers are hungry for resources. So introducing your offer through a "trusted" company can grab the attention of prospects you might not have otherwise reached.