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November 2012 Sea Container Counts Affected by Strike

Written by Steven Hansen

This month’s container data will not enlighten as the busiest ports in the USA (Port of Long Beach and the Port of Los Angeles) were on strike between 27 November and 04 December.  Although the ports were not completely closed down, they operated at 1/3 capacity.  Ships either waited to unload, or moved to alternate ports.

But even adjusting for a shortened month, exports were weak and would have contracted 3.7% year-over-year and contracted 1.9% month over month, while imports would have expanded 3.7% year-over-year, but would have contracted 1.7% month-over-month.  Please note this is a back-of-envelope calculation, and we do not know how much traffic was re-routed days before the beginning of the strike.

This post is based on the real data which was terrible, but should be ignored.

  • traffic has been pulsing for most of 2012 – one good month, one bad month;
  • still, cumulative traffic year-to-date in 2012 remains slightly above 2011 levels for imports, but exports are now under 2011 levels.

The economically intuitive imports are down 3.2% year-over-year (versus last months 5.4%), and up 0.5% year-to-date. There is a direct linkage between imports and USA economic activity.

Exports (which are an indicator of competitiveness and global economic growth) are up 2.4% year-over-year (versus last month’s -2.4%) – and up 0.6% year-to-date.

There is reasonable correlation between the container counts and the US Census trade data also being analyzed by Econintersect. But trade data lags several months after the more timely container counts.

Unadjusted Year-over-Year Change in Container Counts – Ports of Los Angeles and Long Beach Combined – Imports (red line) and Exports (blue bars)

/images/z container1.PNG

Econintersect considers import and exports significant elements in determining economic health (please see caveats below). On a month-over-month basis, exports declined 8.5%, while imports declined 8.7%.

Unadjusted Import Container Counts – Ports of Los Angeles and Long Beach Combined

/images/z container2.PNG

Unadjusted Export Container Counts – Ports of Los Angeles and Long Beach Combined

/images/z container3.png

So far other major transport indicators are mixed but the September data released so far is showing weak growth:

For container counts, only import counts are USA economically intuitive. Using transport as an economic barometer – the real economic growth in the USA seems to be on a two month strengthening binge (two months is not a trend).

The Ports of LA and Long Beach account for much (approximately 40%) of the container movement into and out of the United States – and these two ports report their data significantly earlier than other USA ports. Most of the manufactured goods move between countries in sea containers (except larger rolling items such as automobiles). This pulse point is an early indicator of the health of the economy.

Containers come in many sizes so a uniform method involves expressing the volume of containers in TEU, the volume of a standard 20 foot long sea container. Thus a standard 40 foot container would be 2 TEU.

There is a good correlation between container counts and trade data (the US Census trade data is shown on the graph below). Using container counts gives a two month advance window on trade data.

Inflation Adjusted Year-over-Year Change Imports (blue line) and Exports (red line)

The overall transport started of the year strong, and weakened through mid-year. One month is not a trend, but it appears transport may again be strengthening.

Caveats on the Use of Container Counts

These are extraordinary times with historical data confused by a massive depression and significant monetary and fiscal intervention by government. Further containers are a relatively new technology and had a 14 year continuous growth streak from 1993 to 2006. There is not enough history to make any associations with economic growth – and we must assume a correlation exists.

Further, it is impossible from this data to understand commodity or goods breakdown (e.g. what is the contents in the containers). Any expansion or contraction cannot be analyzed to understand causation.

Imports are a particularly good tool to view the Main Street economy. Imports overreact to economic changes much like a double ETF making movements easy to see.

Contracting imports historically is a recession marker, as consumers and businesses start to hunker down. Main Street and Wall Street are not necessarily in phase and imports can reflect the direction for Main Street when Wall Street may be saying something different. During some recessions, consumers and businesses hunkered down before the Wall Street recession hit – and in the 2007 recession the contraction began 10 months into the recession.

Above graph with current data:

Imports of Goods and Services

Econintersect determines the month-over-month change by subtracting the current month’s year-over-year change from the previous month’s year-over-year change. This is the best of the bad options available to determine month-over-month trends – as the preferred methodology would be to use multi-year data (but the New Normal effects and the Great Recession distort historical data).

Related Articles:

All Transport Posts

All Trade Posts

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