Chapters

Chapters

Lesson 01 / 04

In this lesson

A shared cause of loss
Less damage without a gain
Relationships can change
Money you need to spend

Different assets, shared risks

By STOCKS HELP

Look for the event that could hurt several of your investments at once.

Different claims can share a source of loss.

Two claims on one business

The company struggles
Less money comes in.

Its shares

Owners’ remaining profits and value may fall.

Its bonds

Promised interest and repayment may be at risk.

Losses need not be equal.

Shares in two banks spread the risk of one bank failing. A banking crisis can still hurt both.

Diversification spreads exposure so one poor result has less influence on the whole portfolio. An exposure connects your money to a source of gain or loss.

Spread what you depend on

Spread holdings across asset classes and within them: companies, industries and countries for shares; borrowers, debt types and repayment dates for bonds. Ownership, payment promises and accessible cash serve different roles.

Labels alone leave out important differences. Consider a company whose business deteriorates: both its shareholders and bondholders could suffer. Different claims can share a dependence on the same business; the example supplies no measured correlation between asset classes. Long government bonds are more sensitive to interest-rate changes than shorter debt from the same issuer, other things equal.

Funds can provide broad coverage. Several narrow funds diversify only insofar as their underlying exposures differ.

Connections beyond the issuer

Property businesses may share a local market and financing conditions; exporters, overseas demand. Interest rates and a country’s economy can affect several industries.

A company’s listing country describes the market and legal setting, not all revenue or operations. A foreign listing alone does not establish unrelated business exposure. Broad descriptions can reveal these dependencies without forecasting every company.

The other holding does not have to rise.

An illustrative €10,000 portfolio: €5,000 in A and €5,000 in B. A falls 40% in both cases.

Each full track represents €10,000. Solid = A; striped = B; empty = value lost.

Before either scenario

A €5,000 + B €5,000 = €10,000

B stays unchanged

A €3,000 + B €5,000 = €8,000 (−20%)

B also falls 40%

A €3,000 + B €3,000 = €6,000 (−40%)

No cash flows; returns include income, before costs and taxes. Chosen scenarios, not forecasts.

See how the totals change

A loses €2,000, leaving €3,000. With B unchanged, €3,000 + €5,000 = €8,000: €2,000 below €10,000, a 20% loss.

If B also falls 40%, it ends at €3,000 too. The €6,000 total loses 40%; splitting capital has not softened this common decline.

No probabilities are assigned. These cases isolate how the holdings' joint behaviour changes the total.

B softens the loss simply by holding its value. When both fall together, that protection disappears in this example.

A past relationship can change.

Shares and bonds can both fall. A low historical correlation does not promise that one will offset the other’s loss.

What correlation measures

Correlation describes returns moving together in a sample: positive values indicate a tendency to move in the same direction, negative values in opposite directions. Near zero means little linear relationship, not independence.

Period, observation frequency and measurement currency matter. Monthly returns over a decade can differ from daily observations during disruption. Inflation and monetary-policy expectations can change the relationship between shares and bonds.

Use historical estimates to understand holdings, without treating them as forecasts. Repeatedly chasing favourable recent correlations is a weak basis for a portfolio intended to need little attention.

Will the money be usable?

One cause can worsen two inputs in a stress test: an employer’s difficulties can reduce both its share price and the household’s income. Spreading holdings reduces particular dependencies; broad market risk remains. Diversification neither overrides withdrawal terms nor guarantees a fixed bill after a fall. Compulsory near-term spending also needs access, suitable currency and stability.

For long-term growth, ask what new exposure an addition brings and which dependency it reduces. A new ticker or provider cannot answer that: inspect the assets behind it.

Check your understanding

Try each question, then check your answer.

Choose questions from another chapter

What could hurt both holdings?

You own shares and bonds issued by the same company. Which risk do they still share?

The company's difficulties can hurt both holdings.
The bonds' payment priority makes their repayment independent of the company's operating difficulties.
The different legal claims make the two holdings independent for diversification purposes.

Show the explanation

Correct answer: The company's difficulties can hurt both holdings.

Both depend on the same business. If it struggles, its shares may lose value and its bond payments may be at risk. The claims have different rights, but a different asset label does not remove that common dependence.

Return to the explanation

What happens to the combined value?

You start with €6,000 in A and €4,000 in B. A falls 25%; B stays unchanged. With no cash flows, income included and costs and taxes ignored, what is your portfolio return?

−25%. B would have to rise to help.
−15%. B softens the loss without making a gain.
0%. An unchanged holding cancels the loss.