Giving in South Africa : determining the influence of altruism, inequality aversion and social capital / Nyasha TirivayiThe impact of food transfers for people living with HIV/AIDS : evidence from Zambia / Nyasha Tirivayi, Wim GrootSize and economies of scale in higher education and the implications for mergers / Nyasha Tirivayi, Henriette Maasen van den Brink, Wim GrootWidowhood and barriers to seeking health care in Uganda / Nyasha TirivayiHIV disease severity and employment outcomes in affected households in Zambia / J.N. Tirivayi, J. Koethe