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PLAIN INTEREST

Money and markets, explained plainly

Edition 005 21 Sep–25 Sep 2026

What does the label tell you, and what must you check?

What does the label tell you, and what must you check? This edition separates an account’s tax treatment from its contents, an index headline from its calculation, and trading margin from market exposure. It then follows the evidence behind company announcements and a stablecoin’s target price. Work through the five questions in order, or begin with the one you need. The weekend episodes bring the distinctions together using fresh fictional examples.

01 · Question

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02 · Plain answer

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03 · Picture

04 · Use it

05 · Evidence

Mon · Investing Basics · Foundation

Cash ISA vs Stocks and Shares ISA: what is the difference?

Both ISAs provide a tax framework, but the assets inside and the access terms determine how the money behaves. A Cash ISA normally holds deposits; a Stocks and Shares ISA holds eligible investments whose values can fall. Check the relevant protection rather than assuming the ISA label guarantees capital.

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Tue · Street Smart · Market reality

How is a stock-market index calculated?

An index combines selected securities according to published weighting and adjustment rules. In a free-float market-capitalisation-weighted index, included market value determines influence, while a divisor keeps the scale comparable. Index points are a measure, not your cash return.

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Wed · Trading · Active application

How does leverage magnify trading gains and losses?

Leverage creates exposure larger than the capital committed, magnifying the percentage gain or loss on that capital from the same market move. Margin, financing and forced closure also affect the result. UK retail CFD protections must not be generalised to every leveraged product or client.

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Thu · Small Caps · Specialist equities

How do you read an RNS announcement beyond the headline?

Planned question only; no article has been published yet.

Fri · Crypto · Alternative assets

How does a stablecoin keep its peg, and what can break it?

Planned question only; no article has been published yet.