Wally Weitz: stocks won't stay expensive forever

It's only a matter of time before stock prices revert to the mean, reckons Wally Weitz of Weitz Investments.

Wally Weitz of Weitz Investments, which manages around $4bn, believes that "the majority of stocks are very highly valued relative to... their business value". The main reason for these high valuations is low interest rates and quantitative easing (money printing by the Federal Reserve). However, at some point, today's "artificially low" rates "will get back to normal". Indeed, they might even "get above normal".

At the same time, there is growing evidence of "reversion to the mean of growth rates, market shares and profit margins" (in other words, those measures show signs of falling back towards their historic averages). "Google and Facebook have completely changed the advertising business"; streaming services such as Netflix "are shaking up the pay-TV landscape, and even Disney's ESPN is facing pricing pressure".

The "Amazon effect" has "been devastating to traditional retailing", putting many of the big physical chain stores on the brink of bankruptcy. Weitz warns that pricing pressures in the retail industry "will find their way back upstream to producers of all types of products".

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Another factor to consider is geopolitical risk: "famines, shooting wars, threatened nuclear war with North Korea, secession movements, and less-than-reassuring political leadership". In the long run Weitz still expects the US to "be fine". However, "in the shorter run... we wouldn't be surprised if some of these headlines created some downticks in the stockmarket". He recommends investors hold up to 25% of assets in cash, and create a list of stocks "to buy on short notice should they become available at an attractive price".

Dr Matthew Partridge

Matthew graduated from the University of Durham in 2004; he then gained an MSc, followed by a PhD at the London School of Economics.

He has previously written for a wide range of publications, including the Guardian and the Economist, and also helped to run a newsletter on terrorism. He has spent time at Lehman Brothers, Citigroup and the consultancy Lombard Street Research.

Matthew is the author of Superinvestors: Lessons from the greatest investors in history, published by Harriman House, which has been translated into several languages. His second book, Investing Explained: The Accessible Guide to Building an Investment Portfolio, is published by Kogan Page.

As senior writer, he writes the shares and politics & economics pages, as well as weekly Blowing It and Great Frauds in History columns He also writes a fortnightly reviews page and trading tips, as well as regular cover stories and multi-page investment focus features.

Follow Matthew on Twitter: @DrMatthewPartri