Test negative cash flow

The problem

Economies can fail when upkeep exceeds income.

Practical procedure

Allow net production to become negative in the model and display the projected turn at which reserves are exhausted.

Worked scenario

Starting with 50 coins and losing 7 per turn leaves 1 after seven turns and becomes negative on turn eight.

Acceptance check

Confirm the UI does not silently clamp negative balances to zero or present an impossible purchase as affordable.

Apply the method

Use the related interactive tool to try the concept on an inspectable example. Record the starting assumptions and expected result before changing settings, then compare what the tool actually does. Where the result differs, keep the release marked experimental and document the discrepancy.

Further reading: Relevant primary technical documentation. This guide is an educational procedure, not a substitute for independent usability or compliance review.