Upon the death of his wife, Frida Kahlo, Diego Rivera instructed  Dolores Olmedo Patino, his wealthy patron,  to purchase all the Kahlo paintings she could find.  Paying little for these now priceless works, Olmedo managed to "corner the market" on Kahlo's work, thus insuring that no substantive exhibition of Kahlo's art could be launched without Olmedo's collection (approximately 27 pieces) being involved.  Olmedo had little use for Kahlo, finding her lifestyle disreputable and her art pedestrian.  Ironically, it was Frida's work (and not her beloved Diego's) that proved a lucrative investment for the savvy patron.  As Diego faced death, he named Olmedo as administrator for the joint estates of Kahlo/Rivera, specifying the establishment of "free" museums for the Mexican people.