Outside influences such as increases in the cost of ownership and fuel has begun to push people into cheaper and more reliable cars. So, demand for these cars increases, there is also the effect that people that own the cars are less likely to sell so less supply, over demand is a market force which results in a higher price therefore it may well be possible for the situation of the civics or micras you mention can result in increased prices. However, this is market forces and supply and demand in play and not price fixing.
Price fixing is something that is very rare and incredibly difficult to achieve for the reasons that have been highlighted in the thread so far. It is also counter productive to a successful market place (ie what if you sold your Zed at an artificial fixed high price and the car you wanted next was also fixed above the market rate?) and is why there exists monopolies commissions to ensure that no single organisation controls the majority of demand in a consumer market because that is one of the requirements for price fixing to exist.
Agreed.
Maybe fixing was the wrong word maybe price manipulation as that sounds evil.