Although hunting and poison have been used to control their numbers, it appears that a market-based solution may be the most effective. Sir Peter Elworthy, a prominent farmer, has started an eco-textile industry using opossum fur.
The fur is woven into a lightweight fabric dubbed Kapua that has the warmth of cashmere and the appearance of merino wool. If Kapua fashions are a hit in American department stores, they could help preserve New Zealand's native forests while also warding off the winter chills.

Founded 30 years ago in Bozeman, Montana, PERC—the Property and Environment Research Center—is the nation’s oldest and largest institute dedicated to improving environmental quality through property rights and markets.
PERC’s publications, each designed to resonate with specific groups, move ideas generated at PERC to broader audiences.
Research is at the heart of PERC's work, with a focus on the question: What is the link between economic growth and environmental quality?
The goal of PERC’s programs is to fully realize the vision of establishing “PERC University,” where scholars, students, policy makers, and others convene to expand the applications of free market environmentalism.
PERC's fellowships share a common goal of exposing new scholars, students, journalists, and policy makers to free market environmentalism, as well as enable scholars already familiar with FME to explore new applications.
PERC continues to publish and present a broad range of research and discussion through podcasts, videos, and other multimedia channels.