4 articles from The Journal of Investing are included in this PDF: COMMENTARY: Problems with the Endowment Model by Richard M. Ennis COMMENTARY: The Endowment Model Is Just Active Management by Laurence B. Siegel REBUTTAL: The Endowment Model Defense That Wasn’t by Richard M. Ennis REBUTTAL: The Market Portfolio Is Bigger Than You Think by Laurence B. Siegel