Introductory econometrics assignment. The reasons for creating these two relative price variables is to demonstrate the impact of relative price changes of no.2 and no.3 canned tuna to the unit sales of brand no.1 canned tuna. As a result of that no.2 an
INTRODUCTORY ECONOMETRICS ASSIGNMENT PART 1 a. By using 'Genr' function from eview, to generate two new relative price variables: RPRICE 2 = APR1/APR2 and RPRICE3 = APR1 / APR3. The reasons for creating these two relative price variables is to demonstrate the impact of relative price changes of no.2 and no.3 canned tuna to the unit sales of brand no.1 canned tuna. As a result of that no.2 and no.3 canned tuna are the substitute goods of no.1 canned tuna. Dependent Variable: LOG(SAL1) Method: Least Squares Date: 10/20/11 Time: 23:05 Sample: 1 52 Included observations: 52 Variable Coefficient Std. Error t-Statistic Prob. C 0.27575 0.518528 9.81716 0.0000 RPRICE2 -1.858067 0.513899 -3.615630 0.0007 R-squared 0.207265 Mean dependent var 8.437187 Adjusted R-squared 0.191410 S.D. dependent var 0.813654 S.E. of regression 0.731651 Akaike info criterion 2.250676 Sum squared resid 26.76564 Schwarz criterion 2.325723 Log likelihood -56.51756 Hannan-Quinn criter. 2.279447 F-statistic 3.07278 Durbin-Watson stat .353070 Prob(F-statistic) 0.000696 b. The table above shows the result of estimate function: . is equalled to -1.858067, which means one unit change in RPRICE2 or the relative price change of no.1 and no.2 canned tuna will result in -1.858067 % change in SAL1 or unit sale of no.1 canned tuna. Also, the 95% confidence
Elasticity of demand
Transport Economics Assignment 1 a) Elasticity is the ratio of the incremental percentage change in one variable with respect to an incremental percentage change in another variable. Elasticity is usually expressed as a positive number when the sign is already clear from context. The factors that could affect elasticity of demand for public transport operations would be the rise in public transport costs. An essential service will have a relatively inelastic demand, for example London commuters travelling into the central business district to work. This means that if the fares increase on London underground it will not significantly affect the number of peak passenger's trips because there is no close alternative mode to the rail or tube travel apart from the car and the roads and car parks have inadequate facilities to cope with the additional flows this will leave the commuter spending a lot of time in traffic. For leisure trips that are not essential then demand will be relatively elastic, for example a family trip to the countryside may not take place if fares are high, while at lower fares or with a pricing policy the price per person would be reduced resulting in more unnecessary trips. In the case of a long distance business trip of more than 200 miles, then air travel is the only practical option if a return journey has to be made in one day. This leaves this