This is amplified in Fig. 8a which shows that the price decline in 2007 is preceded by the period 2004–2006 where growth is positive but acceleration changes from positive (2004–2005) to negative in 2006. Fig. 8b presents the
This is amplified in Fig. 8a which shows that the price decline in 2007 is preceded by the period 2004–2006where growth is positive but acceleration changes from positive (2004–2005) to negative in 2006. Fig. 8b presents the