Lesson 05: Growth and Activity Data

Inflation and employment get the reactions. Growth data sets the background they are read against — and when the market's central worry shifts from prices to recession, these releases take over as the ones that move currencies.

PMI and the 50 line

Purchasing Managers' Index surveys the people who buy inputs for businesses, asking whether conditions are better, the same, or worse than last month. The answers are combined into a diffusion index centred on 50.

Reading	Means
Above 50	More firms improving than deteriorating — expansion
Exactly 50	Balanced
Below 50	Contraction
52 rising to 54	Expanding, and faster
56 falling to 52	Still expanding, but slowing sharply

The last two rows carry the trap. PMI measures direction and breadth, not level. A fall from 56 to 52 is an economy still growing, and it often produces a larger market reaction than a move from 49 to 50 — because what changed is the rate of change.

Manufacturing and services are published separately. Services dominates most developed economies; manufacturing turns earlier.
The sub-indices are frequently the story — new orders as a lead on output, employment as an early read on the labour market, and prices paid as an early read on inflation.
It is timely. PMI arrives within days of the month ending, while GDP takes weeks, which is why a survey of opinion outranks a measurement of output here.

Good to know

New orders minus inventories is a widely used quick read: rising orders against falling stock implies production has to catch up. It is one of the few derived numbers in this track that genuinely leads.

GDP estimates and revisions

Gross Domestic Product is the broadest measure of output — and the slowest, which is most of what you need to know about trading it.

The US publishes each quarter three times, a month apart:

Release	Timing	Market reaction
Advance estimate	About a month after the quarter ends	The largest, and still muted
Second estimate	A month later	Small
Third estimate	A month after that	Usually none

By the advance estimate the quarter is already a month gone, and the market has seen three months of PMI, employment and inflation data covering the same period. GDP mostly confirms what was inferred, which is why the broadest measure of the economy is one of the least market-moving releases in this lesson.

What is still worth reading

The composition. Growth driven by consumer spending is a different economy from growth driven by inventory build, and the second tends to reverse.
The deflator, the price index embedded in the calculation — occasionally a genuine inflation surprise hiding in a growth release.
Revisions to prior quarters, which can change the shape of the recent past.

Note

The "two consecutive negative quarters is a recession" rule of thumb is a convention, not a definition. Official bodies date recessions using employment, income and production together, and frequently disagree with the simple rule.

Retail sales and consumption

Consumer spending is the largest component of most developed economies, so a monthly read on it is a monthly read on the majority of GDP.

Headline retail sales includes autos and fuel, both volatile.
Core, or the "control group", strips those out and feeds the consumption calculation in GDP most directly. This is the number analysts quote.
It is reported in money, not volume, which means high inflation inflates it. Strong nominal sales during a period of rising prices can mean people bought less and paid more.

That last point is the one that catches people, and it is the same distinction as nominal and real rates from lesson 1 wearing different clothes. When inflation is high, read retail sales against the price data for the same month or you will read a squeeze as a boom.

What leads and what confirms

Arranging the releases by how early they tell you something is more useful than arranging them by how much they move the market.

	Release	What it is
Leads	PMI new orders	Opinion about the near future
Leads	Building permits, new orders	Commitments not yet acted on
Leads	Jobless claims	Weekly, and it turns before payrolls
Coincides	Payrolls, retail sales, industrial production	What is happening now
Confirms	GDP, unemployment rate	What already happened

Unemployment sits in the last row deliberately: it is a lagging indicator. Firms cut hours before staff, and rehire late. An unemployment rate that is still low is not evidence that a slowdown is not underway.

When activity data outranks inflation data

When inflation is near target, so each reading is no longer news and attention moves to growth.
When a central bank has signalled it is done tightening and the question becomes when it cuts — which is a growth question.
During a credit or banking event, when the market reprices the whole path in days.
When a series breaks trend — the first clearly contractionary PMI after a run of expansion moves more than the tenth.

Which of these regimes you are in is readable from the last few release days: whichever category produced the largest moves is what the market is currently trading. That is a more reliable guide than any framework, because it is measured rather than assumed.

Key takeaways

PMI is a diffusion index around 50 measuring direction and breadth — a fall from 56 to 52 is still expansion, and often moves more than a cross of 50.
GDP is broad and late; by the advance estimate the market has already inferred it, so composition and the deflator are the parts worth reading.
Retail sales are reported in money, so read them against inflation before calling strength.
Sort releases by lead, coincide and confirm — unemployment lags — and let recent release days tell you which category the market is currently trading.

Growth and Activity Data

By the end of this lesson

Before this lesson