Second part of Howard Mark's latest letter is insightful: it's much easier to make money from skill in easy games - inefficient markets allow more alpha-generating opportunities.
Portfolio construction idea:
Focus portable alpha on inefficient markets. Maintain beta exposure through a range of ETFs.
Inefficient markets include: small-cap stocks, frontier markets (Peru, Thailand, Vietnam)
"We arrange our lives, or portfolios, in expectation of what we think will happen in the future"
"performance is what happens when events collide with an existing portfolio"
"The price set by consensus does the best job of estimating the asset's intrinsic value, instead of accurately reflecting it"
Yogi Berra: "In theory, there is no difference between theory and practice, but in practice there is"
"Efficientization should be the presumption"
"Usually a free-lunch counter should be expected to be picked clean"
"few markets demonstrate great structural inefficiency today, but many exhibit a great deal of cyclical inefficiency"
Also, from the Credit Suisse report ("Alpha and the Paradox of Skill" by Michael Mauboussin, available here and here) a couple of nice lines:
"In many competitive interactions it is the relative level of skill that matter, not the absolute level"
"skill cancels out with two competitors with the same skill level. The rest is all luck"
"variance(skill) + variance(luck) = variance(result)" [NB variance(skill) is the spread of skill, not the spread of performance due to skill]
Professor David Hsieh's research: "average amount of available alpha to the hedge fund industry is 3% of total AUM"
David Swensen: Look for top quartile peformers in inefficient markets