Several Materials and Resources credits give a bonus location valuation factor, which allows products extracted, manufactured and produced within 100 mi. (161 km) of the project to take double valuation in credit calculations. The intent of this bonus is Calculator A to shorten construction duration by reducing shipping times B to avoid spreading products with potentially invasive non-native pests to incentivize the purchase of products that support the local economy D to promote design with indigenous materials in order to maintain local aesthetic quality