Prices are also made a lot more volatile  right simply because the world market becomes a residual market, instead of everybody buying and selling through the world market  right, if virtually everybody becomes self sufficient, the world market becomes a bit of a misnomer  right, there isn't such a thing as a world market in that in that particular case  it it may just be a few very small countries trade on the world market, it becomes very small market and therefore prone to supply erm fluctuations in any one country and as we know, supply fluctuations on inelastic demand causes price volatility.