All of the point estimates of the income elasticities are
positive, whereas most of the estimates of the relative price
elasticities are negative. However, the t-statistics show that
these point estimates are statistically insignificant, and there
is evidence that price elasticity (point) estimates are highly varied (Crouch, 1996, p. 119) and are normally situation specific
(Crouch 1995, p. 116).