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=== Material-Flow Analyses (MFA) ===
These analyses track specific material flows along supply chains and across countries. The tracking is primarily done for raw or less processed commodities. It cannot be as globally comprehensive as MRIO, because it also suffers from the truncation problem like LCA.<ref name=":1" />
[[Material flow analysis|MFA]] is based on the quantification and measuring of matter and substances in relation to the processes in a system such as a city or country. It is confined to a specific period of time. Flows are expressed in kg/year or, alternatively, in kg/capita/year. MFA is based on the principle of matter conservation.
The aim is to identify problems and quantifying the exact impact of potential spillovers. However, it needs a large amount of data to accurately function and many countries do not have the data available to do such an analysis. On the other hand, MFA is commonly used especially in matters of [[Sanitation]] and can be used to determine the best sanitation technology. It’s especially well suited to planning and decision making. It’s been proven to be a suitable tool for detection of environmental problems and adequate solutions.
== Types of Indexes ==
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