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Find guidance for your business.

Full explanations, current briefings, Black Lentil editorials, and working files. Sources and checked dates stay with the page.

Business terms explained — acronyms, examples and sources →

Tax masterclass: eight lessons with worked examples · Business calendar

Explanation · Money

A 30% markup is not a 30% margin

The same sale can produce two different percentages. Learn which amount each uses and why the costs you include matter just as much.

Checked September 20, 2026

Explanation · People

Can the business afford another employee?

Look beyond the wage to training, supervision and the work a new person can take on. Test the plan through a slow start and a quiet month.

Checked September 20, 2026

Explanation · Operations

Your shelves are full. Where did the cash go?

Separate stock that protects service from stock that ties up money, and test whether a bulk discount is worth the extra purchase.

Checked September 20, 2026

Explanation · Money

Will a price increase improve the business?

Compare what sales leave after direct costs at each price. Then calculate how many sales you could lose before the price increase leaves you worse off.

Checked September 18, 2026

Explanation · Operations

Why does service change when the owner is away?

A missing order or three different answers can reveal a gap in information, training or capacity. Find the cause before adding another rule.

Checked September 18, 2026

Explanation · Marketing

People like the idea. Will they pay for it?

Find out what people already do about the problem and whether they will commit time or money to your solution. Compliments alone do not establish demand.

Checked September 18, 2026

Explanation · Marketing

What does one new customer actually cost?

Count the costs and new customers over the same period, then compare the cost per customer with what their purchases leave after direct costs.

Checked September 18, 2026

Editorial · Technology

Why new software may not fix the problem

Work out whether the problem comes from unclear responsibilities, missing instructions or the software itself. Then decide what needs to change.

Checked September 18, 2026

Working tool · Money

13-week cash workbook

Enter dated receipts and required payments to find the lowest projected balance before it becomes an emergency.

Checked September 18, 2026

Working tool · Money

Price change calculator

Compare current and proposed contribution, the units needed to preserve the current result, and the effect of an expected volume change.

Checked September 18, 2026

Working tool · Leadership

Weekly owner sheet

Keep current facts, decisions, responsible people, limits, due dates, and unresolved work in one weekly view.

Checked September 18, 2026

Working tool · Marketing

Customer interview record

Record what happened the last time a customer faced the problem, what they tried, what it cost, and what commitment came next.

Checked September 18, 2026