The earnings breakdown

The earnings you can expect to make for referrals will vary depending on the
product you’re referring. They may also depend on the location of the user
you’ve referred the product to. Some referrals pay more when users are U.S.
residents, whereas others pay more when users are located in other countries.
The difference is determined by where the company you’re referring is
located and the target market the company is trying to reach.
Earnings are determined by the product owner or company that offers its
products for referral. For non-Google products, individual advertisers decide
the actions they want visitors to complete and how much they’re willing to
pay for those actions as a result of clicking through the referral ad. You’re
credited for non-Google referrals if a user clicks through your referral ad and
completes the advertiser’s conversion criteria within 30 days of clicking.
For Google products, the earnings schedule is a little different. Well, okay,
it’s not really different, it’s just lain right out there so you can see it without
having to wonder or search for what earnings you can expect to make. Your
earnings for Google referral products are defined as follows:
AdSense: When a user who signed up for Google AdSense through your
referral first earns $100 within 180 days of sign-up and is eligible for
payout, you’re credited with $100. Note that it’s only when the user
first signs up and earns $100. If a visitor has been a member of AdSense
in the past, you don’t receive this payment. Also, this applies only to
referrals located in North America, Latin America, or Japan. All others
are counted as invalid referrals because AdSense doesn’t support other
countries at this time.
Firefox plus Google Toolbar: When a visitor you’ve referred to Firefox
with Google Toolbar runs Firefox for the first time, you’ll receive up to
$1 in your account, depending on the visitor’s location. Your referral
must be a Windows user who hasn’t previously installed Firefox in order
for you to receive credit.
AdWords: When an advertiser you refer first spends $5 on AdWords
ads within 90 days of sign-up, you earn $5. This is in addition to the first
$5 that AdWords gives new users. So, technically speaking, users have
to spend the $5 that AdWords gives them and $5 of their own money
before you’re paid. If that same advertiser spends $100 within 90 days of
sign-up, you’re credited with an additional $40.