Having covered the macro part of the course with my A2. I’ve made a start on productive and allocative efficiency. One concept that the course covers is the Long-Run Average Cost (LAC).
In the short run at least one factor of production is fixed but In the long run the firm can alter all of its inputs, using greater quantities of any of the factors of production. It is now operating on a larger scale. So all of the factors of production are variable in the long run. In the very long run, technological change can alter the way the entire production process is organised, including the nature of the products themselves. In a society with rapid technological progress this will shrink the time period between the short run and the long run.
The long-run average cost (LAC) curve shows the least costly combination of producing any particular quantity. The graph below shows short-run average costs (SATC) and the LAC. The LAC forms a tangent with the SATC and it is therefore the lowest possible average cost for each level of output where the factors of production are all variable – it is formed from a series of SATC curves. The diagram shows:
From the diagram A is the least-cost way to make output Q1 in the short run. B is the least-cost way to make an output Q2. It must be more costly to make Q2 using the wrong combination of factors of production, for example the quantity corresponding to point E. For the combination of factors of production at A, SATC1 shows the cost of producing each output, including Q2. Hence SATC1 must lie above LAC at every point except A, the output level for which the combination of factors of production is best
The LAC is a flatter U-shape than the SATC curves and can be explained by economies of scale and diseconomies of scale. However it is really important to note that the firm does not necessarily produce at the minimum point on each of its SATC curves. Thus the LAC curve shows the minimum average cost way to produce a given output when all factors can be varied, not the minimum average cost at which a given plant can produce.
The Long-Run Average Cost is sometimes abbreviated to LRAC The Short-Run Average Cost is sometimes abbreviated to SRAC
This LAC is also know as the envelope curve (looks similar to the back of an old style envelope) – see image.
You will no doubt have covered economies and diseconomies of scale in a some form in economics courses. A recent example of the latter is the car manufacturing industry in Australia with Mitsubishi, Ford, Holden, and Toyota all closing, or in the process of closing, manufacturing operations.
At the turn of the century Australia produced over 400,000 cars a year but this was soon halved to 200,000 by the end of 2013. The global market has become ever smaller and Australian car manufacturers have struggled especially as consumers now want less of the gas guzzling V8’s to middle of the range, fuel efficient cars. Holden and Ford haven’t focused on these models. Some of the key points responsible for their demise:
1. In order to achieve economies of scale car plants need to be producing at least 200,000 cars a year – most plants in Australia produce 100,000.
2. Car plant employees in Australia earn very high wages and only German workers earn more.
3. Manufacturing costs in Australia are 4 times greater than Asian manufacturers and 2 times that of European plants.
4. The resource boom has meant the AUS$ has appreciated which has made Australian exports more expensive. With a lot of spare capacity in the global market for cars prices are very competitive.
5. For a long time generous state handouts have kept the industry solvent. That has now dried up.
Below are graphs explaining economies and diseconomies of scale.
No doubt you have come across the movie documentary “Black Gold” which looks at the global coffee industry focusing on the plight of coffee farmers in Southern Ethiopia. The Indian onion market has similar characteristics and it is the farmers that lose out the most. Here are some of the issues that they have encountered:
* Higher rural wages have pushed up farmer’s costs
* Farms are small and therefore lack potential economies of scale
* The supply chain involves 5 middlemen who take their cut on the way through
* The onion is loaded, sorted or repacked at least 4 times
* Retail prices are double what farmers get
* Poor quality onions get dumped as there is no modern food-processing industry in India where they could be put to use.
* Little stock of onions is held in reserve so prices can vary greatly
Foreign food companies, including Walmart, Carrefour and Tesco, have been keen to make inroads into the Indian market. This would undoubtedly reduce the number of middlemen who take their cut on the way through and the development of modern storage facilites would assist in stabilising onion prices.
The Economist Free Exchange looked at how economies of scale for some firms have started to run out. When the average cost curve slopes downwards it means that average costs are decreasing as output increases. Whenever this happens the firm is experiencing economies of scale. If on the other hand the average costs are increasing as output increases the firm is experiencing diseconomies of scale – see graph below A-C economies of scale and C-D diseconomies of scale.
Container ship are a good example of economies of scale.
* 1950’s – they could carry 480 twnety-foot equivalent (TEU) containers
* 2006 – they could carrry 15,000 TEUs
* By 2013 – they will be able to carry 18,000 TEUs
As shipping costs per container keeps coming down container ships are expected to keep getting bigger.
Diseconomies – Skyscrapers and European Farmers
However, the idea of building something bigger will generate increasing economies of scale is not always the case. Think about a skyscraper, as you start to get above a certain height the cost per floor level starts to increase as there are structural aspects of the buidling that must be addressed and also with the core of the building getting larger as teh the building gets taller the amount of useable office space get reduced. Therefore if developers were looking at cost structures for buildings they would probably build mid-size buildings.
Many of the eastern bloc countries in the European Union are economic basket cases, still struggling to pick themselves up after the fall of communism in the early 1990’s, and this worries exporters who fear the big Western European economies maybe dragged down by their influence. The majority of their economies are weighed down by inefficient agricultural sectors inherited from the communist era and massive diseconomies of scale. If we look at Poland’s milk production, it is equivalent to New Zealand’s however this is spread over 500,000 farms and processed by 414 processing applications (US Department of Agriculture statistics). In New Zealand there are approximately 12,000 dairy farms.