2. The Contracting States shall give sympathetic consideration to assimilating the rights of all stateless persons with regard to wage-earning employment to those of nationals, and in particular of those stateless persons who have entered their territory pursuant to programmes of labour recruitment or under immigration schemes. Article 18 Self-employment The Contracting States shall accord to a stateless person lawfully in their territory treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances, as regards the right to engage on his own account in agriculture, industry, handicrafts and commerce and to establish commercial and industrial companies. Article 19 Liberal professions Each Contracting State shall accord to stateless persons lawfully staying in their territory who hold diplomas recognized by the competent authorities of that State, and who are desirous of practising a liberal profession, treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances. CHAPTER IV WELFARE Article 20 Rationing Where a rationing system exists, which applies to the population at large and regulates the general distribution of products in short supply, stateless persons shall be accorded the same treatment as nationals. Article 21 Housing As regards housing, the Contracting States, in so far as the matter is regulated by laws or regulations or is subject to the control of public authorities, shall accord to stateless persons lawfully staying in their territory treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances. Article 22 Public education 1. The Contracting States shall accord to stateless persons the same treatment as is accorded to nationals with respect to elementary education. 2. The Contracting States shall accord to stateless persons treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances, with respect to education other than elementary education and, in particular, as regards access to studies, the recognition of foreign school certificates, diplomas and degrees, the remission of fees and charges and the award of scholarships.