Week 10 Session: A Number About Tomorrow

Every target so far already existed. Today's does not — a dated commitment from the Reserve Bank, what happened instead, and a forecast you seal shut

10 May 2027

A rainfall total already fallen. A Census already taken. A business case already published. Every target this course has given you so far already existed by the time you picked up a range. Today that stops — what you commit to next does not have an answer yet, anywhere, for anyone.

A dated commitment#

On 2 February 2021 the Reserve Bank of Australia’s Governor published this, under his own name, as the Bank’s official position:

“The Board will not increase the cash rate until actual inflation is sustainably within the 2 to 3 per cent target range. For this to occur, wages growth will have to be materially higher than it is currently. This will require significant gains in employment and a return to a tight labour market. The Board does not expect these conditions to be met until 2024 at the earliest.”

Read it the way you would read any of this course’s ranges. It names a threshold, states the reasoning behind it, and gives a plain-language sense of timing — not before 2024. The Bank repeated close variants of this statement across its following meetings through the rest of 2021.

What happened instead#

On 3 May 2022 — fifteen months later — the same Governor published this:

“At its meeting today, the Board decided to increase the cash rate target by 25 basis points to 35 basis points… The Board judged that now was the right time to begin withdrawing some of the extraordinary monetary support that was put in place to help the Australian economy during the pandemic.”

Not before 2024 became a rise in May 2022. The Bank later acknowledged, in public testimony, that the guidance had been heard as more certain than it was intended to be — that people had made decisions, including on their own mortgages, on the strength of a form of words the Bank itself would since choose differently.

What this is not#

This is not a lesson about inflation or monetary policy, and you do not need either to take the point. Set aside every question of why the economy moved the way it did. What is left, once you do, is a single fact worth all your attention: a national institution put a dated, conditional claim about the future on the public record, and fifteen months later the record itself supplied the score. Nobody had to argue about whether the claim held. The calendar answered it.

The same grammar, one variable changed#

Week 4 gave you four things to write before you looked: a low bound, a high bound, a confidence in plain words, and a line naming what would make the range miss. Every one of those still applies today, unchanged.

What is different is where the unknown sits. In week 4 the number already existed and only your knowledge of it was incomplete. Today the number does not exist at all, for anyone, until the date in question arrives. Your miss-line can no longer be about what you failed to notice — it has to name a condition about the world between now and then.

The class forecast#

One target, shared by the whole room:

Canberra Airport’s official daily maximum temperature on 20 May 2027, as published in the Bureau of Meteorology’s Daily Weather Observations for Canberra, ACT.

That product states plainly whose readings it carries — “Observations from Canberra Airport” — so there is no ambiguity about which of the several Canberra-area stations answers this. The date sits ten days after this session and resolves well before week 12.

Before anyone checks a forecast site or a long-range outlook, write down:

• a low bound you are fairly confident the day’s maximum will sit above;
• a high bound you are fairly confident it will sit below;
• your confidence, in plain words;
• one line: what would have to be true about that day for your range to miss;
• the source named above, as the thing that will resolve it.

Seal it — an envelope, a locked note, whatever your room uses. It is not opened, checked, or spoken about again until week 12. Nobody simulates the result between now and then, and nobody revises the bounds once they are written down; a forecast edited after the fact is not a forecast.

This is the one Week 10 entry the Calibration Diary requires of you.

Leaving#

You have made a claim about something that has not happened yet. It is not in the Bank’s form — a bounded range with a stated confidence is not conditional forward guidance, and yours resolves on a named date against a named product. What the two share is the discipline that matters here: a claim about the future, put on the record in advance, specific enough that the world can later be checked against it by someone who was not in the room. What the Bank’s case adds is the only thing forecasting ever adds to estimation: nothing to check today, and everything to check on the date you named.