Some price movements repeat at the same point every year. They follow the calendar of production and shipping abroad rather than anything happening in the domestic market.
Harvest calendars set food import prices
Agricultural goods are produced in concentrated seasons and stored for the rest of the year. Prices are lowest immediately after harvest and rise as stocks deplete.
Importing from the opposite hemisphere smooths this, since the two harvests fall six months apart. Countries with diverse sourcing show flatter price patterns than those dependent on one origin.
Where supply is concentrated in a single region, the seasonal pattern survives fully. Storage cost and quality decline both push prices up through the year.
Factory shutdown periods interrupt supply
Manufacturing regions observe extended holiday closures during which production and shipping largely stop. Buyers order ahead to cover the gap.
Freight rates rise sharply in the weeks before these closures as everyone ships simultaneously. The cost of that rush is embedded in goods arriving afterwards.
The restart is gradual rather than immediate, since workforces return over several weeks. Lead times remain extended well past the nominal reopening.
Shipping peaks add their own cycle
Retailers stock for year-end selling months in advance, concentrating demand for container space into a defined window. Rates rise regardless of the annual trend.
Goods bought during that peak carry higher freight cost into the following selling season. The freight paid and the price charged are separated by months.
Port congestion during peaks adds delay and storage charges, which compound the same effect. Both costs land on the importer.
Why the pattern is not always visible
Retailers smooth prices deliberately, absorbing seasonal cost variation rather than repricing constantly. The cycle exists in their costs without appearing on the shelf.
Promotional calendars can also run counter to cost cycles, with discounts timed to demand rather than supply. The two schedules are independent.
Statistical agencies adjust published inflation figures for known seasonality, which removes the pattern from headline data. The underlying movement is still occurring.
Using the calendar in household planning
Goods with strong seasonal sourcing are cheapest shortly after the relevant harvest or production period. Timing purchases of storable items to that window is a genuine saving.
Durable goods follow product cycles instead, with prices falling as replacement models approach. That calendar is set by manufacturers rather than by climate.
Neither pattern is guaranteed in any given year, since weather, disruption and policy changes override them. The cycles describe tendencies rather than rules.