Relationships Between Investments — Portfolio Theory
“Whoa!”
Daniel nearly dropped his cup of coffee.
“You’re telling me putting money into two risky investments can actually make things safer?”
Mr. Kofi laughed.
“Ha! That’s exactly why many people struggle with investing. They think risk only adds up. Sometimes it cancels itself out.”
“That doesn’t even sound possible.”
“It didn’t sound possible to me either when I first learned it forty years ago.”
Daniel leaned forward.
“Okay, explain.”
Mr. Kofi pointed toward two houses across the street.
“Imagine I own a company that builds luxury houses.”
“Sounds profitable.”
“It can be. But luxury homes depend heavily on wealthy buyers. During tough economic times, sales drop quickly.”
Daniel nodded.
“That makes sense.”
“Now imagine I also build affordable starter homes.”
“Different customers.”
“Exactly. Sometimes when luxury sales slow down, affordable homes continue selling.”
Daniel’s eyes widened.
“Oh!”
“There it is,” Mr. Kofi laughed. “That little ‘Oh!’ is what portfolio theory is all about.”
“So the investments behave differently?”
“Yes.”
He drew two lines on a notepad.
“Most beginners focus only on return.”
“And that’s wrong?”
“Not completely. But it’s incomplete.”
Mr. Kofi tapped the paper.
“You must consider both return and risk.”
“What exactly is risk?”
“The possibility that actual results differ from what you expected.”
Daniel nodded slowly.
“So if I expect to make ten thousand dollars and end up making five thousand, that’s risk.”
“Correct.”
“And if I make fifteen thousand?”
“Also risk.”
Daniel blinked.
“Wait… really?”
Mr. Kofi smiled.
“Risk isn’t only bad surprises. It’s uncertainty.”
“Huh.”
“Investors usually measure that uncertainty by looking at how much results can move around.”
Daniel scratched his head.
“So where does the portfolio part come in?”
“Imagine you put all your money into one investment.”
“High risk.”
“Right.”
“Then I spread it across several investments.”
“Better.”
“But why exactly?”
Mr. Kofi leaned back.
“Because not all investments move together.”
A car horn sounded outside.
He paused before continuing.
“If one investment performs poorly while another performs well, the gains can offset the losses.”
Daniel snapped his fingers.
“Like having multiple streams of income.”
“Exactly.”
“Whoa. That’s actually simple.”
“The best ideas often are.”
Daniel looked thoughtful.
“So the goal isn’t finding the perfect investment.”
“No.”
“It’s finding investments that work well together.”
Mr. Kofi smiled.
“Now you’re talking like an investor.”
Daniel laughed.
“I’ve been searching for the one magic opportunity.”
“Most people do.”
“And there isn’t one?”
“There are good opportunities. But relying on only one is dangerous.”
Daniel nodded.
“So how do we know whether investments move together?”
Mr. Kofi grinned.
“Now we’re getting to the interesting part.”
He drew three arrows.
“Some investments move in the same direction.”
“Okay.”
“Some move completely independently.”
“Got it.”
“And some move in opposite directions.”
Daniel sat upright.
“Opposite directions?”
“Yes.”
“When one rises, the other falls.”
“Wow.”
“Those combinations can be extremely valuable.”
Daniel stared at the page.
“So two risky investments could create a safer overall portfolio?”
“Correct.”
“That’s wild.”
Mr. Kofi laughed loudly.
“Every student reacts exactly the same way.”
Daniel shook his head.
“My brain still wants to believe more investments equal more risk.”
“Because most people think about risk individually.”
“And portfolio theory looks at them collectively?”
“Exactly.”
A moment of silence followed.
Then Daniel asked,
“Is it possible to remove all risk?”
Mr. Kofi immediately shook his head.
“No.”
“None at all?”
“Not in the real world.”
“So what can investors do?”
“They can reduce risk without necessarily sacrificing return.”
Daniel whistled softly.
“That sounds powerful.”
“It is.”
Mr. Kofi took a sip of tea.
“Imagine two farmers.”
“Okay.”
“One grows only maize.”
“Right.”
“The other grows maize, vegetables, and fruit.”
Daniel smiled.
“I already know who sleeps better at night.”
“Exactly.”
“If one crop fails, the others might survive.”
“That’s diversification.”
Daniel laughed.
“So portfolio theory is basically diversification with mathematics.”
Mr. Kofi pointed at him.
“Perfect description.”
The younger man grinned proudly.
“Finally something in finance makes sense.”
“Oh, don’t worry,” Mr. Kofi said. “Finance will confuse you again soon enough.”
Both burst out laughing.
Daniel became serious again.
“So investors should never focus only on return?”
“Never.”
“Because a high return might come with huge risk.”
“Correct.”
“And a slightly lower return with much lower risk could actually be the smarter choice.”
Mr. Kofi nodded.
“Now you’re thinking like someone who plans to stay wealthy.”
Daniel looked out the window.
“You know, that’s different from how social media talks about investing.”
Mr. Kofi chuckled.
“Social media celebrates winners.”
“And ignores survivors.”
“Exactly.”
Daniel sat quietly for a moment.
“Wow.”
“What?”
“I always thought successful investors were people who found extraordinary investments.”
Mr. Kofi smiled.
“Some do.”
“But?”
“Most successful investors build extraordinary portfolios.”
Daniel slowly nodded.
That idea stayed with him.
Not finding the perfect investment.
Building the right combination.
For the first time, investing felt less like gambling and more like careful planning.
“Thank you, Mr. Kofi.”
The old man smiled warmly.
“You’re welcome.”
Then he laughed.
“And remember—never fall in love with a single investment.”
Daniel grinned.
“Lesson learned.”