From Monday, bus and train fares (not the Subte) basically double, if you are not using a SUBE card (see link below). Apologies its in Spanish, but in any case gives a pretty clear example of a fare before (antes) and now (ahora).
http://www.infobae.com/notas/662846...-pagaran-mas-los-viajes-desde-este-lunes.html
http://www.infobae.com/notas/662846...-pagaran-mas-los-viajes-desde-este-lunes.html