Companion files

Contract Management

What the Clauses Actually Cost, and How to Price Them Before You Sign

These are the four Excel workbooks that go with the book. Larchmere Industrial ran a competitive tender, received two bids, and signed the cheaper one: 104.00 a unit against 109.50, a gap of 5.50 worth 1,228,920.00 over three years on the business case volumes. The price did hold. What the approval paper never priced was the paper the price came attached to. The eight clauses that differ between the two agreements cost 1,565,906.48, the realised price saving was 87,304.04, and the net position against the bid that was rejected is −1,478,602.44. That is a swing of 2,707,522.44 against the approved case, and 94.68 per cent of it was knowable on the day of signature. The signed price path crosses the rejected bid’s in month nineteen, which is inside the term. Every figure the book prints is reproduced here by a live formula rather than a typed constant, and each workbook ends with a Checks sheet setting the printed figure beside the computed one: 82 checks in all, every one passing on delivery. If a check ever reads FAIL, the workbook is wrong, not the book.

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All four workbooks

Download the ZIP92 KB

Everything described below is inside it, with the read-me.

The four workbooks

Conventions used throughout

Blue textan input: change it and everything recomputes
Yellow fillan assumption that decides the answer rather than merely feeding it: the six operational rates, the low case volume that prices every threshold in the agreement, and the annual cap on the alternative. In the third workbook every input cell carries the fill, because on a contract not yet signed every one of them is an assumption somebody is making
Black texta formula: do not overtype these
Grey texta note
Green texton the Checks sheet, the published figure being checked against
Checks sheetthe printed figure beside the computed one, the difference, and a PASS or a FAIL

There are no macros, no external links, no protection and no circular references anywhere, and nothing is locked or watermarked. The files behave identically in Excel, LibreOffice and Google Sheets.

Why the checks matter more than the models

A workbook that agrees with a book proves nothing on its own, since the author wrote both. What the Checks sheets do is different: they force the model to reproduce a number that was printed before the model existed, from a formula rather than from the number itself. 82 checks across the four files, being 24, 20, 21 and 17, all passing on delivery.

On this book the discipline earns its keep twice. The first time is on rounding. The model rounds at each step, as any contract administrator would, and a workbook that compounds at full precision produces figures that are defensible, different, and wrong against the printed page. Fourteen checks failed on the first build for that reason alone, and the fix was to make every formula round where the model rounds rather than to widen the tolerance.

The second time is on double counting. Indexation is worth 892,881.88 over the term and it appears nowhere in the 1,565,906.48 clause package, because its effect is already inside the price gap the bridge starts from. Adding it would produce a larger, more impressive and entirely false number. The workbooks display it, label it, and refuse to sum it, and a check holds the clause package to the seven lines that belong in it.

The assumptions most worth arguing with are the two index paths and the low case volume. Move the annual cap on the alternative from nothing to 3.00 per cent and the cost of the indexation clause falls from 892,881.88 to 354,572.71, a saving of 538,309.17 which is 3.3708 a unit and the single most valuable thing nobody asked for. Move the volume band threshold from 55,000 down below your own low case and 514,263.68 of surcharge disappears. Type your own figures instead and watch which answers move and which do not.

Opening the files

The workbooks open in Microsoft Excel, LibreOffice Calc, Google Sheets and Numbers. They use no macros and no add-ins, so nothing needs to be enabled or trusted. If your spreadsheet asks to update links on opening, decline, because there are none.

Also by Julian R. Sterling

The other books with companion files. The full list of titles is on the author page.