In his 1913 Principles of economics Seager further extended his theory of production and distribution.
Seager explained:
"Since the relations we are trying to picture are between flows of goods rather than fixed funds of goods, certain of their aspects may be more easily presented in graphic than in arithmetical form.
The [accompanying] figure... represents capitalistic production in a self-contained industrial society brought to a state of normal equilibrium.
In it are represented in successive and connected compartments the three great branches of production: the extractive industries, manufacturing, and transportation and trade..."
About the flows in the model, he explains:
"...Raw materials, the products of the extractive industries, flow through from left to right, being enriched as they pass along by the addition of form, place, time and possession utilities.
On leaving the hands of dealers, they are separated into two great streams, one, the replacement fund, which flows back to repair and renew capital goods worn or destroyed in the process of production, the other, consumption goods, which begin immediately to gratify wants.
The consumption goods stream is again subdivided, one branch conveying the second and subordinate replacement fund needed to repair and renew the durable consumption goods whose presence is indicated at the top of the diagram and which give off a continuous stream of utilities to mingle with those afforded by transient consumption goods, the other and larger branch into which the main consumption goods stream is divided."

And furthermore:
"The net product represented in this diagram consists in part of raw materials, in part of manufactured goods, finished and unfinished, and in part of the utilities subsequently added at the stage 'transportation and trade.'
Only a very limited part is sufficiently advanced to be flowing out with the stream of consumption goods to minister directly to human wants.
On the other hand it is from this stream of consumption goods that the entire real income for which the money income is exchanged is drawn.
Although the identical goods constituting the real income are thus for the most part other than the goods constituting the net product, the latter consists of exactly similar utilities quantitatively and qualitatively as the former.
At each point the streams of goods flow on evenly and unbrokenly so that the " transient consumption goods " that are allowed to escape, and which constitute the real income, are exactly replaced by the goods included in the net product.
The diagram thus represents movement without change.
It depicts the circulation of goods that is going on in actual industrial society with the elements of change and monopoly eliminated."

In "The economics of retailing" Paul Nystrom (1915) further focussed in the 'transportation and trade' stage, and assigned various patterns in the channels of distribution.
In his 1913 Principles of economics Seager further extended his theory of production and distribution. Seager explained:
"Since the relations we are trying to picture are between flows of goods rather than fixed funds of goods, certain of their aspects may be more easily presented in graphic than in arithmetical form. The [accompanying] figure... represents capitalistic production in a self-contained industrial society brought to a state of normal equilibrium. In it are represented in successive and connected compartments the three great branches of production: the extractive industries, manufacturing, and transportation and trade..."
About the flows in the model, he explains:
"...Raw materials, the products of the extractive industries, flow through from left to right, being enriched as they pass along by the addition of form, place, time and possession utilities. On leaving the hands of dealers, they are separated into two great streams, one, the replacement fund, which flows back to repair and renew capital goods worn or destroyed in the process of production, the other, consumption goods, which begin immediately to gratify wants. The consumption goods stream is again subdivided, one branch conveying the second and subordinate replacement fund needed to repair and renew the durable consumption goods whose presence is indicated at the top of the diagram and which give off a continuous stream of utilities to mingle with those afforded by transient consumption goods, the other and larger branch into which the main consumption goods stream is divided."
And furthermore:
"The net product represented in this diagram consists in part of raw materials, in part of manufactured goods, finished and unfinished, and in part of the utilities subsequently added at the stage 'transportation and trade.' Only a very limited part is sufficiently advanced to be flowing out with the stream of consumption goods to minister directly to human wants. On the other hand it is from this stream of consumption goods that the entire real income for which the money income is exchanged is drawn. Although the identical goods constituting the real income are thus for the most part other than the goods constituting the net product, the latter consists of exactly similar utilities quantitatively and qualitatively as the former. At each point the streams of goods flow on evenly and unbrokenly so that the " transient consumption goods " that are allowed to escape, and which constitute the real income, are exactly replaced by the goods included in the net product. The diagram thus represents movement without change. It depicts the circulation of goods that is going on in actual industrial society with the elements of change and monopoly eliminated."
In "The economics of retailing" Paul Nystrom (1915) further focussed in the 'transportation and trade' stage, and assigned various patterns in the channels of distribution.
Henry Rogers Seager