Natural resources
Prussia’s control of the Rhineland and its natural resources helped grow its
economy.
Austria had limited access to natural resources (coal, iron) and so was not as
economically successful as Prussia.
The Zollverein
Prussia also controlled the Zollverein, giving it huge
influence on most states in the German Confederation.
Austria however was excluded from membership of the
Zollverein, a decision which angered them.
Main obstacle? Yes
Economic issues further increased arguments
between Prussia and Austria, limiting the chances of
unification.
Other states worried about Prussia’s power and its likely
domination of a united Germany.
Main obstacle? No
Economic differences were simply part of the wider divide between Austria and Prussia.
These were no more important than issues
such as religion, military, politics, etc.