Wilhelm Roscher,
Principles of Political Economy…
“ With an advance in a people's public economy, we find an increased rapidity of circulation connected, both as cause and effect. Every improvement, every thing which shortens the process of production, must facilitate and accelerate the circulation of commodities. And so, the perfecting of the means of transport of commodities, of the media of exchange and of credit, an increase in the number of middlemen who make it their business to purchase in order to sell again. On the other hand, the more rapid the circulation of wealth, the more can it promote production. ”
