Effec­tive­ness of incen­tives pro­gram or mar­ket­ing devel­op­ment fund (MDF). MDF is a fund pro­vid­ed by a com­pa­ny to its part­ners or affil­i­ates to help them mar­ket and sell the com­pa­ny’s prod­ucts or ser­vices. Inven­tive pro­grams are sim­i­lar, but may involve finan­cial incen­tives or rewards for achiev­ing spe­cif­ic sales or mar­ket­ing goals.