A business card should be nice coloured and synthetical but complete. However, this is the way everybody will consider to make it. But what I have to say is that I am not convinced that the business card is the one which produces promotion effects, but the results of your activity, your rank in SFI and the dimension of your passive income. Mention them on your business card. Then, all the recipients will be willing to come to you and address you questions about SFI and enroll in it. This is my opinion.
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