When in the opinion of the Tax Collector it is necessary for efficient administration of this Chapter, he may regard any salesman, representative, peddler, canvasser, or agent of any dealer, distributor, supervisor, or employer under whom he operates or from whom he obtains tangible personal property for sale, rental, lease, or license as a retailer for the purposes of this Chapter, irrespective of whether he is making sales, rentals, leases, or licenses on his own behalf or on behalf of others. The Tax Collector may also regard such dealer, distributor, supervisor, or employer as a retailer for the purposes of this Chapter.