Market economies are based on market forces like supply and demand. Mixed economies fall in the middle of market and command economies (where economic choices are governed by some central entity usually the government). The former Soviet Union (USSR) is an example of a command economy where economic choices (what to buy, sell and produce) where made by the government. If Australia is becoming more of a market economy and less of a mixed economy, fewer decisions are made by the government. Here's a diagram of two major types of economies:
Command Economy <-------------- Mixed Economy --------> Market Economy
(Government makes the decisions) (A little of both) (Individuals decide)
The big difference between Eastern Europe and Western Europe is that Eastern Europe consists of countries that once belonged to the Soviet block, unlike the Western half. Economically, the Western Europe nations are much more advanced than the Eastern Europe nations. Western Europe outputs a lot more cash due to a larger free trade and more open economy as a whole.
The bill is introduced by the President. Bill is not introduced by the President, but by a member of Congress.
The more people that are migrating to urban areas (urbanization) needs more crops for the citizens which causes more people to grow crops and without crop rotating or methods to prevent soil degradation. More likely answer is that more industry grows in the urbanized areas and they have poor management of the soil which causes soil degradation<span />