class BusinessChain : public Bitcoin

{

public:

  void make_money(int how);

  enum how_to_make_money {

    by_printing_it;

    by_raising_its_value;

    by_predicting_its_value;

    by_predicting_its_value;

    by_making_a_new_blockchain;

    //still ridiculous when you're big by_working_for_it_yourself;

    //still ridiculous when you're big by_selling_things_yourself;

  }

};