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Get a cup of coffee.

In this thread, I'll walk you through the basics of leverage -- in our personal lives and in the companies we invest in.
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Imagine we have an idea for a business.

To start the business, we need to put in $1M.

In return, the business will generate $250K for us every year -- for 10 years.

So, our upfront investment is $1M. But over the next 10 years, we get to take out $250K * 10 = $2.5M.
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This is an "unleveraged" annual return (IRR) of about 21.4%.

"Unleveraged" means we don't borrow any money.

That is, we use our own money for the initial $1M investment.

For more on IRRs and how to calculate them: https://twitter.com/10kdiver/status/1284536987861446657
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What if we instead borrow part of the $1M?

This would be a "leveraged" scenario.

For example, let's say we use 4:1 leverage.

That means: to get the initial $1M, we put in $200K of our own money, and borrow the remaining $800K.

$800K : $200K = 4:1.
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Of course, when we borrow money, we have to pay interest.

Suppose our interest rate is 5% per year.

That means: we pay 5% of our $800K loan = $40K in interest each year.
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Plus, at the end of 10 years, we have to return the principal ($800K).

To do this, let's say we set aside $80K per year -- in each of the next 10 years.

At the end of 10 years, that will leave us with $80K * 10 = exactly the $800K we'll need to pay back the loan.
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So, of the $250K our business will generate for us each year, $40K goes towards interest and $80K is set aside to pay back the principal.

This leaves us with $250K - ($40K + $80K) = $130K in cash that we can take out of the business each year.
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So, *with* leverage, our cash flows look like this:

We put in $200K upfront.

We take out $130K per year -- over the next 10 years.

That's a *leveraged* IRR of about 64.6% (annualized).
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So:

Unleveraged IRR = ~21.4% per year.
Leveraged IRR = ~64.6% per year.

That's the power of leverage.

In physics, leverage lets us move a heavy object using a small force.

In investing, leverage allows us to get a high return using a small amount of capital.
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But unfortunately, that's not the whole story.

The problem is: Leverage comes with risk.

This risk decreases our margin of safety.
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For example, what happens if our business performs below our expectations?

That is, what if our $250K per year projection turns out to be overly optimistic?

How much of a hit can we take to that $250K before we start losing money?
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In the *unleveraged* case, we put in $1M of our own money.

So, as long as the business makes at least $100K per year (over 10 years), we won't lose money. We'll be "in the black".

That is, our "margin of safety" is $250K - $100K = $150K per year.
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What about the *leveraged* case?

Here, we need $120K per year just to "service" the loan ($40K for interest, $80K for principal).

Plus, we need an extra $20K per year to break-even on the $200K of our own money that we put in.
14/

So, for us to be "in the black", the business will need to generate at least $120K + $20K = $140K per year.

That means: our "margin of safety" is only $250K - $140K = $110K per year.

So, leverage has reduced our margin of safety by ~27% -- from $150K to $110K per year.
15/

This is the crucial thing to understand when it comes to leverage:

Leverage can amplify returns.

But it also amplifies risk.

As leverage increases, our tolerance for error -- our "margin of safety" -- decreases; it doesn't take much to push us from black to red.
16/

For example, this plot shows our IRR vs our business's cash flows -- at various leverage levels (1:1, 2:1, etc.).

With no leverage (the blue line), our IRR drops gracefully as cash flows decrease.

But as leverage increases, our IRRs drop off much more sharply.
17/

Of course, businesses employ various kinds of leverage -- some more dangerous than others.

For example, some businesses use short term liabilities that they constantly "roll over".

This can include negative working capital, insurance float, deferred taxes, etc.
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Usually, this leverage is benign.

But for that:

a) the liability shouldn't suddenly shrink by a lot (eg, insurance policies that run off but don't renew), and

b) the business shouldn't rely on credit markets (ie, the kindness of strangers) to roll over short term debt.
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Long term debt (eg, via corporate bonds) is another form of leverage.

This is somewhat more risky -- as periodic interest and principal payments are usually required.

But as long as such obligations are fixed and known ahead of time, they can be planned for.
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The most dangerous form of leverage is one that could require the business to post a lot of cash at short notice.

For example, a bank run.

Or a naked derivatives contract that blows up.

Or a disaster that triggers claims from a large number of insurance policies.
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Time and again, Buffett's letters warn us of the dangers of such kinds of leverage:
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When we invest in companies that employ significant amounts of leverage, it's crucial to understand our margin of safety -- how bad can things become before the result is permanent loss of capital?
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Ideally, the business's cash flows (even in bad years) should more than cover any interest/principal payments.

Also, the business should have sufficient balance sheet strength (ie, assets that can be readily converted to cash) to meet all near-term obligations.
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Similar logic also applies to managing leverage in our *personal* finances.

Here are a few tips for that.

Tip 1. We should never trade on margin. It's a Russian roulette type situation.

Most of the time, securities bought on margin may not go down drastically.
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But from time to time, they will.

This can trigger a "margin call" that can obliterate us.

In effect, this transforms "short term volatility" into "long term risk".

So, it's best to avoid trading on margin, naked options strategies, etc.
26/

Tip 2. As far as possible, we should avoid taking out a loan to buy a *depreciating* asset.

This includes automobiles, and most things bought with credit cards.

So, a corollary is to pay off credit cards in full each month.
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Tip 3: When taking out a loan to buy an *appreciating* asset (eg, a mortgage to buy a house), we should follow 3 simple rules.

Rule 1. We should clearly understand our obligations (eg, fixed vs variable interest rates, monthly payments, additional insurance needed, etc.).
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Rule 2. Our *current* earning power and assets on hand should be more than adequate to meet our obligations (both interest and principal).

Rule 3. Margin of safety. We should be able to take a reasonable hit to our earnings/assets and still meet our obligations.
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If you're still with me, thank you very much!

Leverage is a fairly basic topic.

But it's the No. 1 culprit behind most financial disasters.

I hope this thread showed you both the benefits and the pitfalls of leverage.

Please stay safe. Enjoy your weekend!

/End
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