An increase in sales share for the tested brand and a decrease for the
main competitor were noticed after introduction and a two-week TV
advertisement of the display unit A (see Figure 7.1). However, these
tendencies balanced out after a few weeks, and the sales shares went
back to approximately the same level as before the unit was introduced.
Even after the introduction of the display unit B, the market reaction
faded after a few weeks, though not all the way back to the original
sales share level. Three months after the introduction, the sales share of
the tested brand was at a level equal to that of the main competitor. The
third brand, ie the second competitor, was basically unaffected by the
introductions. It should be mentioned that the third brand is mainly
perceived by most people as an import and of inferior quality.
The really interesting finding comes when considering not only the
sales share impact for different brands but also the total sales for this
subcategory of products. In the first period of four weeks, sales equalled
the index of 100. In the second period, when the display unit A was
used, the index scored 111. In the third period, when no display units at
all were used, the index scored 99. In the fourth period, when the display
unit B was used, the index amounted to 124. Finally, the fifth period