If you're a keen investor then you will have almost certainly heard of the Fundsmith Equity Fund and its high-profile manager Terry Smith.

To date the Fundsmith Equity Fund has produced results which are nothing short of spectacular – a total return of 100% in just over four years. But is such rapid growth sustainable?

Dividend growth is the driver of sustainable growth

With any sort of investment there are two kinds of value: the market value and the fundamental value (also known as the intrinsic value).

The market value of a house, a classic car or a company's shares can be pretty much anything. If I want to sell my house for £20 then I can, and that will be the market price. On the other hand if someone wants to buy my house for £20 million then that will be the market price instead.

The house is essentially the same in both situations but the market price is very different.

The fundamental value of an investment is the price an informed and “reasonable" seller or buyer would be happy to accept or pay.

Fundamental value is still set by investors and so can vary to some extent, but not anywhere near as much as the market value. That's because the market value is often driven by investors who are neither informed nor reasonable.

In most cases fundamental value relates mostly to an investment's ability to pay an income, both today and in the future.

In the case of a house, fundamental value relates to the rental income which a property can reasonably be expected to generate over many years. For shares, fundamental value is driven primarily by the dividend; what it is today and what it is expected to be in the future.

Sustainable growth in market value occurs when that growth is accompanied, in more or less equal measure, by growth in fundamental value. In the case of a house, if rents double over a number of years then it is likely that the fundamental value has doubled as well. It is then reasonable for the market value to double as well (again, more or less, with some degree of variability and uncertainty).

However, if the market value of a house or a company's shares double while there is no meaningful increase in fundamental value – i.e. rental income or dividend income – then that growth in…

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