# Rel margin

A segment's margin against the margin of the profit-making segments together: 1.00x is the group's own.

## Definition

In Profit by segment, the segment's share of profit divided by its share of revenue (the two columns before it), both over the segments that made a profit. 1.50x earns half as much again per unit of revenue as the group; 0.50x earns half as much.

## Why it matters

A segment can be half the sales and a tenth of the profit. This shows it in one number, without comparing two columns of shares.

## How Standard Equity uses it

A level in the latest year, not a change. A dash for a profit line that also includes items outside its segments (Berkshire's insurance), and for a segment whose profit is above its revenue (an oil major's upstream sells mostly inside the group).

## The metric

| Category | Breakdown Tables |
| -------- | ---------------- |
| Unit     | x                |

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