Michael Lipton
... that developmental economist Michael Lipton showed that poor farmers were more resource efficient than rich farmers?
... that <a href="./Development_economics" id="mwAQQ" rel="mw:WikiLink" title="Development economics">developmental economist</a> <b id="mwAQU"><a href="./Michael_Lipton" id="mwAQY" rel="mw:WikiLink" title="Michael Lipton">Michael Lipton</a></b> showed that poor farmers were more resource efficient than rich farmers?