At hospitals in Kaiping, a patient always gives red envelopes to surgeons/doctors ... to entice them to do a 'good' operation ... meaning ... "take care of me instead of treating me like every other patient ... be delicate in your surgical procedure, don't be rough ... etc etc".
Common amount is 200 RMB. Another RE if the doctor's children are in school. i.e. here's some money to help pay for your kid's tuition.
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Here's a weird business practice ... David50, you'll laugh at this or maybe not because you're aware of the practice ... In Kaiping's real estate construction industry, the hired builder is required to put the total amount of money UPFRONT then they have to wait one to two years to be paid for the job from the client. In most cases, because of shortgage of cash from the client, the builder has to sell the property to recoup his outlay or accept other possessions like cars, jewellry, apartments etc etc as payment. But it's the risk they take because profit margins in construction is huge.