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Effectiveness and Economic Impact of Tax Incentives in the SADC ...

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ECONOMICS OF TAX INCENTIVES 3-11<br />

5. <strong>Economic</strong> Distortions. Economists are very concerned about economic distortions that arise<br />

from tax <strong>in</strong>centive programs. These are not well understood by most stakeholders, yet <strong>the</strong>y<br />

can be decisive <strong>in</strong> determ<strong>in</strong><strong>in</strong>g whe<strong>the</strong>r <strong>in</strong>vestment tax <strong>in</strong>centives foster growth <strong>and</strong><br />

development. <strong>Tax</strong> <strong>in</strong>centives reduce efficiency <strong>and</strong> productivity <strong>in</strong> two ma<strong>in</strong> ways:<br />

•<br />

Foster<strong>in</strong>g low productivity. Figure 3-1 shows <strong>the</strong> normal case where tax <strong>in</strong>centives reduce <strong>the</strong><br />

effective user cost <strong>of</strong> capital from UCC0 to UCC1 <strong>and</strong> <strong>the</strong>refore <strong>in</strong>crease <strong>in</strong>vestment from I0<br />

to I1. The issue at h<strong>and</strong> is that capital <strong>in</strong>vestments to <strong>the</strong> left <strong>of</strong> I0 are viable even without<br />

<strong>the</strong> tax break; <strong>the</strong> <strong>in</strong>vestments that are affected by <strong>the</strong> tax break (<strong>in</strong> <strong>the</strong> range I0-I1) are <strong>the</strong><br />

ones with relatively low productivity. Hence, tax <strong>in</strong>centive programs tend systematically to<br />

foster <strong>in</strong>vestments with a low or marg<strong>in</strong>al rate <strong>of</strong> return.<br />

One clear case <strong>of</strong> adverse impact on efficiency is <strong>the</strong> use <strong>of</strong> protective tariffs to stimulate<br />

<strong>in</strong>vestment <strong>in</strong> high-cost production activities, so as to shield uncompetitive domestic<br />

producers from import competition. Exhibit 3-3 expla<strong>in</strong>s how this policy works.<br />

Figure 3-1<br />

<strong>Tax</strong> <strong>Incentives</strong> <strong>and</strong> <strong>the</strong> User Cost <strong>of</strong> Capital<br />

User cost <strong>of</strong><br />

capital<br />

UCC 0<br />

UCC 1<br />

<strong>Tax</strong> benefit<br />

Value <strong>of</strong> marg<strong>in</strong>al<br />

product <strong>of</strong> capital<br />

I 0<br />

I 1<br />

Investment

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