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Dairy's role in sustaining New Zealand - Fonterra

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2. Modell<strong>in</strong>g dairy’s economic contribution<br />

over the past decade<br />

2.1 Objective of modell<strong>in</strong>g<br />

The section above has shown that the dairy sector has witnessed significant growth over the<br />

past decade. A key question is: how has this growth benefited the rest of the economy? In<br />

particular, we are <strong>in</strong>terested <strong>in</strong> two aspects of this growth:<br />

• The short term impacts of milk solids payout <strong>in</strong>creases<br />

• The longer term impacts of volume growth <strong>in</strong> the sector over the last 10 years.<br />

We exam<strong>in</strong>e these two aspects us<strong>in</strong>g a relatively newly developed economic model of the<br />

<strong>New</strong> <strong>Zealand</strong> economy.<br />

2.2 Modell<strong>in</strong>g technique<br />

The dairy sector <strong>in</strong>teracts with the rest of the economy by generat<strong>in</strong>g exports and<br />

employment, us<strong>in</strong>g <strong>in</strong>termediate <strong>in</strong>puts such as fertilizer, and compet<strong>in</strong>g for use of land,<br />

labour and <strong>in</strong>vestment. In order to get a sense of how the <strong>New</strong> <strong>Zealand</strong> economy as a whole<br />

might be impacted by production and price changes <strong>in</strong> the dairy sector, we need to use<br />

an economic model that takes these <strong>in</strong>teractions <strong>in</strong>to account. We use NZIER’s dynamic<br />

Computable General Equilibrium (CGE) model of the <strong>New</strong> <strong>Zealand</strong> economy to evaluate the<br />

impacts of the price and volume growth <strong>in</strong> the dairy sector.<br />

2.3 Advantages of CGE modell<strong>in</strong>g<br />

Our dynamic CGE model is a more robust framework than alternatives approaches for<br />

estimat<strong>in</strong>g the contribution of the dairy sector to the <strong>New</strong> <strong>Zealand</strong> economy. The most<br />

commonly used alternative is <strong>in</strong>put-output (IO) or ‘multiplier’analysis. IO or multiplier analysis<br />

has two significant limitations:<br />

• It does not adequately consider the reallocation of resources follow<strong>in</strong>g a ‘shock’to the<br />

economy, such as a surge <strong>in</strong> demand for dairy exports. In particular, multiplier analysis<br />

assumes that resources (land, labour, capital, energy, <strong>in</strong>termediate <strong>in</strong>puts) are available<br />

Dairy’s <strong>role</strong> <strong>in</strong> generat<strong>in</strong>g growth<br />

9

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