In Bern, Donna and Karen are also part of a community that collectively takes the time and effort to reduce waste. For example, residents recycle not only because they care about the environment, but also because there is a strong financial incentive. Recycling is free, but throwing away garbage costs money: Each garbage bag has to have a sticker on it, and each sticker costs at least 1 euro (approximately $1.30 US); that is, the less you throw out, the less you pay. If you have no sticker, then your garbage is left outside your house to rot. swissworld.org What approach best describes what Bern uses to encourage reuse and recycling?