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posted on 14 January 2017

December 2016 Import and Export Sea Container Rolling Averages End Year On Improving Trend

Written by Steven Hansen

This month both imports and exports trend lines accelerated further into positive territory - and end the year on a positive note.

Analyst Opinion of Container Movements

This month was one of the highest growth months of the year, and the rolling averages improved. This data series is noisy and it is best to view the data using the 3 month rolling average. Imports and Exports remain on an improving trend line. Imported container counts were at the highest levels in 2016 since the Great Recession. Exports in 2016 exceeded 2015 but the quantities were about the average seen since the end of the Great Recession.

Using this data to forecast the USA economy, the indications are at this point of a continued weak but improving growth of consumption.

This data set is based on the Ports of LA and Long Beach which 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.

Consider that imports final sales are added to GDP usually several months after import - while the import cost itself is subtracted from GDP in the month of import. Export final sales occur around the date of export. Container counts do not include bulk commodities such as oil or autos which are not shipped in containers. For this month:

Acceleration Month-over-Month Change from One Year Ago Year to Date vs. Previous Year Acceleration 3 Month Rolling Average 3 Month Rolling Average vs. Average One Year Ago
Imports +1.5 % +7.9 % +2.7 % +4.4 % +7.1 %
Exports +0.5 % +12.1 % +5.1 % +2.0 % +11.7 %

As the data is very noisy - the best way to look at this data normally is the 3 month rolling averages. There is a direct linkage between imports and USA economic activity - and the change in growth in imports foretells real change in economic growth. Export growth is an indicator of competitiveness and global economic growth.

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.

Econintersect considers import and exports significant elements in determining economic health (please see caveats below). recession levels.

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)

Transport sector growth in general has been trending down since mid-2015.

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 (below):

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).



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