The provided line graph delineates the average Japanese monthly income with the prices of two main kinds of televisions: the color and monochromatic ones over a 30-year period starting from 1970 to 2000.
Overall, there are two clear visible trends among these categories. While the costs to purchase these televisions demonstrated a notable decline, the Japanese’s salary per month exhibited a sharp rise.
At the starting point, the black and white TVs represented the highest price (about 110 Yen), followed by the color ones which cost 10 Yen less. In the next section, the price of single color TVs reached a low point at 40 Yen in 1980; similarly, the other ones also declined steeply to 55 Yen after a circular decade. Both continued to decrease gradually and hit a trough at the end of the period.
Conversely, there are significant differences in the average salary patterns. The monthly income accounting for the lowest price with a mere 20 Yen consistently increased between 1970 and 1990. From this turning point (by 1990), it surprisingly soared and reached a peak at 70 Yen in 2000.