Exercise 2: Zero-Based Budgeting Isn't "Spend It All" — Possible Solution
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This chapter's own real definition of zero-based budgeting is that
every pound of income is deliberately assigned a specific job -
including a job called "savings" or "investing" - until income minus
every allocation equals exactly zero. Reaching zero doesn't mean the
money was spent; it means every pound has a planned destination, and
one of those destinations can absolutely be a savings account, an
emergency fund, or extra debt repayment.

The colleague's version - "spending your entire paycheck down to
nothing" - assumes zero-based budgeting is only about consumption,
when the actual method is about assigning a purpose to every pound,
consumption being just one of several real categories a pound can be
assigned to. A zero-based budget with a genuinely well-planned savings
allocation still reaches a real "zero" on paper, while the person's
actual bank balance and savings both keep growing month over month -
the "zero" refers to unallocated pounds, not to money spent.

ANSWER: This misunderstands the method - reaching "zero" in zero-based
budgeting means every pound has been assigned a specific job, not that
every pound was spent on consumption. Savings, investing, and extra
debt repayment are all legitimate real jobs a pound can be assigned to,
so a zero-based budget can (and often should) include a real savings
allocation while still reaching zero on paper.

WHY THIS WORKS AS AN ANSWER
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This correctly distinguishes "every pound assigned a job" from "every
pound spent," directly reusing the chapter's own real definition rather
than accepting the colleague's flattened, consumption-only reading of
the term.