“…A matching rate of 1 has proven to be effective in crowding in donations in several settings (Davis, ; Gneezy et al ., , Huck et al ., ; Kesternich et al ., ). However, there are cases in which it did not work out (Davis, ; Karlan et al ., ; Helms McCarty et al ., ) and sometimes smaller matching rates have been sufficient (Davis, ; Huck et al ., ; Eckel and Grossman, ).…”