The line graph illustrates the changes in the average monthly earnings of Japanese workers and the costs of black and white and colour televisions between 1970 and 2000.
Overall, the average incomes of people in Japan increased rapidly over the period, while the prices of both black and white and colour televisions experienced a significant decline.
Regarding the price of colour TVs, 100 Yen was recorded in 1980, which then fell steadily by nearly half to more than 50 Yen in 1990 before witnessing a minimal drop and reaching its lowest point at below 50 Yen at the end of the period. Similarly, the costs of black and white televisions also showed downward trends over the 30-year period. At the beginning of the period, the figure for non-colour TVs stood at 110 Yen, which was the highest at that time; however, the costs declined sharply to just 40 Yen in 1980 and continued to decrease to approximately 20 Yen by 2000.
In contrast, the average salary for Japanese workers saw a remarkable climb. In the first 10 years, the figure remained unchanged at around 19 or 21 Yen, which then grew considerably before overtaking the others and reaching its highest figure.