The line graph compares the cost of color TV and black and white TV, and the average salary per month over the course of 30 years, starting from 1970.
Overall, it is clear that the price of two kinds of TV witnessed a downward trend, while the average salary increased. Notably, the most drastic change can be seen in the cost of black and white TV.
As for the expense of two kinds of TV with decreasing trends, in 1970, black and white TV cost 110 yen, which was the highest number among categories, then the price declined significantly to 40 yen in 1980. Similarly, it decreased gradually to under 30 yen and intersected the average salary at thí point in 1990 before dropping to 20 yen in 2000. Contrastly, in 1970, there was no price for color TV. The expense of color TV was 100 yen in 1980, following that it fell dramatically by around 45 yen in 1990. After that, it met the average salary at 50 yen in 1995 before declining to approximately 50 yen in 2000.
In terms of the monthly earnings, in 1970, it stood at about 20 yen, then it increased gradually to about 30 yen, which was the intersection of the price black and white TV and the average income. After that, it rose to 50 yen and was equal to the price of color TV at this point in 1995. Finally, it grew by around 20 yen in 2000.