Disposal costs vary greatly. In some countries, waste disposal is informal and therefore not officially accounted for. In high-income countries, disposal costs are better accounted for and are typically between US$50 and US$100 per tonne. Recycling costs for high-income countries are often comparable to the cost of landfilling. Recycling is sometimes made cheaper when landfills are taxed or when limited capacity is available and market prices for landfilling increase. Construction and operation of anaerobic digestion and incineration systems require a large budget and high management and technical capacity, and the technologies are rarely used for municipal waste in low- and middle-income countries.