Microsoft algorithm #1:

  for all companies {
    if (company == Microsoft) next;     // Fixes bug in version 1.0
    // How threatening are they to us?
    if (threat(company,Microsoft)) {
      if (cost(company) < cost(Microsoft->copy_ideas(company))) {
        Microsoft->buy(company);
      } else {
        Microsoft->copy_ideas(company);
      }
    }
  }