How people have made artificial light over the past 4,000 years reflects the history of economic growth in the world. One economist has explored the cost of light, starting in ancient Babylonian times and ending in the 1990s. He discovered that for most of the past four millennia, light was very expensive. Then, in the past 200 years, scientific advances caused the cost of light to drop precipitously, and economies grew with a speed and intensity unknown before. Listen to hear how light became cheap and how its cost helps show how economic growth happens.
Story Length: 6:43
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Some basic economic norms shape how most retail stores operate. These include: attract as many potential shoppers as possible; make it easy for them to find what they need; and make it appealing for them to return often so that they will spend money at the store. But some members-only warehouse stores break all those rules--and succeed anyway. Listen to find out why these stores do it differently, and why, despite breaking the rules of retail, they thrive.
The luxury goods company Hermes makes and sells a high-end purse it calls the Birkin Bag. The Birkin costs $10,000—often more—and it is nearly impossible to find one to buy. Because very few bags are available, the Birkin has become a status symbol, something only very few people can buy. Its scarcity raises its value, which could explain why a purse can cost so much money. Listen to find out why a retail company, that by definition wants to sell things, makes it so difficult to buy their product.
This story explores an important economic question: When a kid loses a tooth, how much should the tooth fairy pay? That may sound like a joke, but the tooth fairy’s payoff provides an example of inflation—the amount the price of goods increases each year—and of the economic principle called “income elasticity of demand.” Listen to the story to find out what teeth are going for these days, and what economists have to say about it.
The Lexile Audio Measure is an indicator of the complexity of an audio passage. It is based on a scientifically developed scale with a maximum score of 2000L.How to Use Lexile Audio Measures
Find stories at the right level of complexity for your students, so that they will be challenged without being frustrated. The measures are categorized into low, medium, or high in order to aid teachers in story selection when they do not know students’ Lexile listening levels.
|Listening Level||Lexile Audio Measures|
These recommended ranges are for instructional use of Listenwise audio content in combination with supports such as the interactive transcript, etc.
|Grade||Lexile Audio Measures (Recommended Ranges)|
|1||215L - 610L|
|2||490L - 855L|
|3||725L - 1060L|
|4||945L - 1250L|
|5||1045L - 1350L|
|6||1125L - 1430L|
|7||1190L - 1500L|
|8||1250L - 1555L|
|9||1300L - 1610L|
|10||1345L - 1655L|
|11/12||1385L - 1695L|