The government encouraged the use of Swahili as a national language, although English remained the main medium for parliamentary debates and the language of instruction in schools and universities. The historian Robert M. Maxon nevertheless suggested that "no national culture emerged during the Kenyatta era", most artistic and cultural expressions reflecting particular ethnic groups rather than a broader sense of Kenyanness, while Western culture remained heavily influential over the country's elites. Independent Kenya had an economy heavily moulded by colonial rule; agriculture dominated while industry was limited, and there was a heavy reliance on exporting primary goods while importing capital and manufactured goods. Under Kenyatta, the structure of this economy did not fundamentally change, remaining externally oriented and dominated by multinational corporations and foreign capital. Kenyatta's economic policy was capitalist and entrepreneurial, with no serious socialist policies being pursued; its focus was on achieving economic growth as opposed to equitable redistribution. The government passed laws to encourage foreign investment, recognising that Kenya needed foreign-trained specialists in scientific and technical fields to aid its economic development. Under Kenyatta, Western companies regarded Kenya as a safe and profitable place for investment; between 1964 and 1970, large-scale foreign investment and industry in Kenya nearly doubled. In contrast to his economic policies, Kenyatta publicly claimed he would create a democratic socialist state with an equitable distribution of economic and social development. In 1965, when Thomas Mboya was minister for economic planning and development, the government issued a session paper titled "African Socialism and its Application to Planning in Kenya", in which it officially declared its commitment to what it called an "African socialist" economic model. The session proposed a mixed economy with an important role for private capital, with Kenyatta's government specifying that it would consider only nationalisation in instances where national security was at risk. Left-wing critics highlighted that the image of "African socialism" portrayed in the document provided for no major shift away from the colonial economy. Kenya's agricultural and industrial sectors were dominated by Europeans and its commerce and trade by Asians; one of Kenyatta's most pressing issues was to bring the economy under indigenous control. There was growing black resentment towards the Asian domination of the small business sector, with Kenyatta's government putting pressure on Asian-owned businesses, intending to replace them with African-owned counterparts. The 1965 session paper promised an "Africanization" of the Kenyan economy, with the government increasingly pushing for "black capitalism". The government established the Industrial and Commercial Development Corporation to provide loans for black-owned businesses, and secured a 51% share in the Kenya National Assurance Company.