real GDP (20 points)

some sentences are quoted from wiki.
http://en.wikipedia.org/wiki/Gross_Domestic_Product#The_components_of_GDP

GDP = consumption + investment + (government spending) + (exports − imports), or, GDP = C + I + G + (X-M)

Note for 1 and 2, GDP counts work that produces no net change or that results from repairing harm. For example, rebuilding after a natural disaster or war may produce a considerable amount of economic activity and thus boost GDP.

1. your renovation/repair spending would be measured as Consumption. increase in C.
If the renovation involves the purchase of a chandelier from abroad, that spending would also be counted as an increase in imports, so that NX would fall and the total GDP is unaffected by the purchase. (This highlights the fact that GDP is intended to measure domestic production rather than total consumption or spending. Spending is really a convenient means of estimating production.)
but since it is unlikely that all materials are imported, real GDP should increase.

2. rebuilding of factories increase Investments.
possible side effects: less export of products, less purchase by the factories
Overall, it is likely to be a positive increase in GDP

3. Increase private consumption in tickets, increase in C, increase in GDP

4. Increase Export of services and tourism, increase in X, so increase in Net eXport. increase GDP

Hope this answers your questions ^^

2007-11-29 19:40:34 補充：
re-establishing the factories will take a lot of Inverstment, so the overall change to real GDP could outweigh the other effects. It really depends on the extent of the damages, and the sort of business these factories are in.