«38.7. Persons cannot be said to act in the ordinary course of their own business if, in place of the enterprise, such persons perform activities which, economically, belong to the sphere of the enterprise rather than to that of their own business operations. Where, for example, a commission agent not only sells the goods or merchandise of the enterprise in his own name but also habitually acts, in relation to that enterprise, as a permanent agent having an authority to conclude contracts, he would be deemed in respect of this particular activity to be a permanent establishment, since he is thus acting outside the ordinary course of his own trade or business (namely that of a commission agent), unless his activities are limited to those mentioned at the end of paragraph 5». OECD Model Tax Convention. Condensed Version (2010) Commentary to art. 5. § 38.7. P. 108.