The state shall practice strict economy and combat waste. The state shall appropriately handle accumulation and consumption, give due consideration at once to the interests of the state, collectives and individuals and, based on the development of production, gradually improve the material and cultural wellbeing of the people. The state shall establish a sound social security system compatible with the level of economic development. Article 15 The state shall practice a socialist market economy. The state shall strengthen economic legislation and improve macro regulation. The state shall, in accordance with law, prohibit disruption of the socioeconomic order by any organization or individual. Article 16 State-owned enterprises shall, within the scope prescribed by law, have the right to operate autonomously. State-owned enterprises shall, in accordance with the provisions of law, practice democratic management through employee congresses and other means. Article 17 Collective economic organizations shall, on the condition that they abide by relevant laws, have the autonomy to independently conduct economic activities. Collective economic organizations shall practice democratic management and shall, in accordance with the provisions of law, elect and remove their management personnel and decide on major issues concerning their operations and management. Article 18 The People's Republic of China shall permit foreign enterprises, other economic organizations and individuals, to invest in China and to enter into various forms of economic cooperation with Chinese enterprises or other economic organizations in accordance with the provisions of law of the People's Republic of China. All foreign enterprises, other foreign economic organizations and Chinese-foreign joint ventures in the territory of China shall abide by the law of the People's Republic of China. Their lawful rights and interests shall be protected by the law of the People's Republic of China. Article 19 The state shall develop socialist education to raise the scientific and cultural level of the whole nation. The state shall run schools of all types, provide universal compulsory primary education, develop secondary, vocational and higher education, and also develop preschool education. The state shall develop different types of educational facilities, eliminate illiteracy, provide political, cultural, scientific, technical and field-specific education for workers, peasants, state employees and other working people, and encourage people to become accomplished individuals through self-study. The state shall encourage collective economic organizations, state enterprises, public institutions and other social actors to run education programs of various types in accordance with the provisions of law. The state shall promote the common speech - putonghua - used nationwide. Article 20 The state shall develop the natural and social sciences, disseminate scientific and technological knowledge, and commend and award research achievements and technological discoveries and inventions. Article 21 To protect the people's health, the state shall develop medical and health care, develop modern medicine and traditional Chinese medicine, encourage and support the running of various medical and health facilities by rural collective economic organizations, state enterprises, public institutions and neighborhood organizations, and promote public health activities. To improve the people's physical fitness, the state shall develop sports and promote public sports activities. 6