No-fee open access journals, also known as "platinum" or "diamond" do not charge either readers or authors. These journals use a variety of business models including subsidies, advertising, membership dues, endowments, or volunteer labour. Subsidising sources range from universities, libraries and museums to foundations, societies or government agencies. Some publishers may cross-subsidise from other publications or auxiliary services and products. For example, most APC-free journals in Latin America are funded by higher education institutions and are not conditional on institutional affiliation for publication. Conversely, Knowledge Unlatched crowdsources funding in order to make monographs available open access.