AEF362: CLASS NOTES 1

Key points

From Paper 1:    Food Mountains and Famines (the World View)

From Paper 2:    Northern Region Agriculture and Rural Development: What Futures?  ( The Local View) Questions & Discussion: Simple Story of why Trade (and associated specialisation) is a "Good Thing"
Any society (household, region, nation etc.) can be represented as having a particular productive capacity, given its resources of land, labour, capital and management) such that its production possibilities are shown as the Production Possibility Frontier - concave to the origin, since some resources are better at producing one thing (say M) than another (say G).

Without trade (under conditions of autarchy), this society will choose some particular mix of M and G (say at point A, producing and, necessarily, consuming amounts Am and Ag respectively).  Notice that this choice, whatever it is, necessarily requires that the rate at which these two goods can be exchanged (both on the supply (ppf) side and the demand side of the local domestic market) will be equal to the Autarchy Price Ratio.  Supply price (the slope of the ppf) is equal to the demand price (given by the choice exercised by the society as to which mix of goods to consume).  The market is in balance, and, providing that the ppf and the choices exercised by society include all public goods and externalities), the efficient price.  Supply curves - the price at which succesive amounts of any one good can be produced - necessarily slope upwards for this reason.  (Question -  do demand curves necessarily slope downwards, and does it matter if they don't?).

Trade will only occur if this society meets and negotiates with some different society (with different ppf, and/or different social valuations on the possible products).  If all societies are exactly the same, then trade will neither happen nor be sensible.  Trade relies on differences - so the "level playing field" notion is very misleading.

When trade happens, a new and different price ratio will be established - the Trade Price Ratio.  This society can now choose a new combination of goods to consume, not totally restricted by its own ppf - it can specialise in the production of the good which is more valuable in trade (good M in this case), and export some of this good (amount Pm(t) less Am) in return for imports of G (amount Cg(t) less Pg(t)).  Amount Ex of M buys amount Im of G on the 'world' market.  So now our society is consuming at point Tc (chosen arbitrarily here to be the same amount of M as before, but more G - unambigously better off.  By how much?

By the value of the additional G consumed, valued at the pre-trade price ratio given by the autarchic price ratio.  Or, by the increased income generated by trade - the value of the exports valued at the trade price ratio.  The two values are not identical - they are measured at different price relatives (real prices).  Which is the most relevant depends on the reasons we need the measurement - but the difference does not invalidate the general principle - people are better off if they specialise and trade.  Otherwise, we wouldn't do it.  And we do, all the time.  Very very few of us, if any, really choose to be totally self-sufficient - life is too short and too miserable if we do.

Restriction of trade or distortion of trading price ratios necessarily makes our society worse off than it otherwise could be.  Q.E.D.


An Illustration:  The gains to be made from elimination of EU Dairy Quotas and associated price support
Intervention buying, export refunds and import levies on dairy products (Skim Milk Powder (SMP) and Butter) support domestic EU prices at Pm, with production restricted by quota at Q*.  Elimination of quota alone, without also eliminating supported prices, makes no sense (make sure you understand why not).

However, if both are eliminated, producers lose less than consumers and taxpayers gain.  The combined producers loss and consumers gain results in a net loss in surplus shown in the diagram, which is necessarily less than the taxpayers gain.

See the summary of the recent study of the consequences of quota elimination for the current estimates of the gains versus the losses (from the DEFRA web site containing the whole report) in preparation for next weeks class - and come prepared to answer the question as to why quotas were introduced in the first place, if they are now such a "bad" thing!



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