The pages from the videos, live.
Every Money Internals video is driven through one of these interactive pages. They're working tools — open one, change the inputs, watch the machine respond. Education, not financial advice.
PathToolEpisode
/orderbook
Build an Exchange
The order book terminal, one page per episode — where prices come from, market vs limit, and the queue.
BUILD AN EXCHANGE · EP 1–3
/pension
The pension series
Compounding, the £100k tax trap, and the 20% relief most people never claim — one page per episode.
PENSION SERIES · 01–03
/book-to-bill
The order queue
Why revenue stops at capacity, what a backlog is and isn't, and how long a fab takes to land.
MARKET MECHANICS · 01
/pension-vs-isa
Pension vs ISA — two jars
The same £1,000 of pay, taxed on the way in or on the way out — and the three settings that decide which jar is bigger.
UK MONEY MECHANICS
/mortgage-split
Your first mortgage payment
£1,461 a month, and in month one only £420 of it buys the house — the crossover, what an overpayment does, and why a rate reset jumps the payment.
UK MONEY MECHANICS
/wyao-bonds
Why bond prices fall when rates rise
Two friends, two bonds, one rate rise: why the 30-year falls eight times more than the 2-year, and when the price actually costs you anything.
WHAT YOU ACTUALLY OWN · 01
/himm-capex
The AI capex problem
Four buyers set the budget: why a supplier paid out of the extra dollars sees its sales halve when spending grows 10%, and why it takes 37% just to stand still.
HOW IT ACTUALLY MAKES MONEY · 01
/cash-burn
Why loss-makers swing hardest
Two made-up companies worth the same today: why a rise in rates or a cut in hopes moves the one whose value is years away two to three times as much, both ways.
MARKET MECHANICS · 02
/marginal-rate-map
UK tax bands at every salary
The tax on your next £1 from £20,000 to £150,000, all in: the 62% between £100k and £125k, the child benefit charge, a student loan on top. 2026/27.
UK MONEY MECHANICS
Source for everything here is public — the exchange build lives at github.com/MoneyInternals/mini-exchange, this site at github.com/MoneyInternals/tools.