The line graph compares the average monthly salary of Japanese people and the cost of two types of television sets, namely colour and black & white, between 1970 and 2000.
Overall, the prices of both TVs underwent a downward trend by varying degrees over the examined years, with black and white TVs exhibiting a decrease in price. In contrast, the income of Japanese workers recorded an opposite pattern, surpassing the others to become the highest figure by the end of the timeframe.
Looking first at the prices of colour televisions, it emerged as the most expensive item, at 110 Yen in 1970. After a decade, this figure sharply plummeted to 40 Yen and gradually fell during the rest of the period, reflecting the lowest price over the surveyed years. Similarly, the cost of black and white TVs commenced at a considerable 100 Yen in 1980, dramatically dropping to 55 Yen in 1990 and marginally declining to just south of 50 Yen in 2000.
Unlike the aforementioned expense of TVs, the monthly salary of Japanese workers followed a reverse trajectory, with an initial modest 20 Yen in 1970. The income steadily grew over two decades to approximately 30 Yen before significantly escalating to 70 Yen in 2000, ranking the largest figure in the end of the period.