During the 1960s, sunglasses became fashionable accessories worn throughout the year and were no longer considered seasonal products.
the increase in sales was partly attributable to the popularity of several films during the early 1980s that featured well known actors wearing sunglasses.
In 1998, sales of sunglasses equaled $1.9 billion, with mass retailers accounting for $262 million, optical outlets $406 million, and sunglasses specialty stores $495 million.
Retail sales in the sunglasses market rose from $361 million in 1985 to $1.5 billion by the end of the decade, reflecting a 100 percent increase from 1980.
the rapid spread of the shopping mall
The average price of sunglasses rose 50 percent between 1990 and 1997, when a pair cost $23.06, largely on the strength of name-brand varieties.
the rise of 1960s counterculture
Tie-dye became popular in the United States in the late 1960s, during the counterculture movement and the rise of psychedelic art and fashion.
a rise in demand
Truck sales are on the rise especially used. This is because they offer a better value than new trucks.
The price of movie star's brand of sunglasses will rise because of a movement up the supply curve.
musical theatre and modern jazz
yes they do rise during deflation