How do consumers access, buy and use their favorite products and services? The answer to the seemingly simple question is changing. Traditionally, people often see ownership as the most desirable way to have access to products. However, an increasing number of consumers are paying to temporarily access or share products and services rather than buy or own them Customer behavior towards many goods and services changes from ownership to sharing. This transformation of people's consumption, habits has made sharing economy grow and it seems that some individuals and companies have already benefited from this trend.

Growth in sharing systems bas particularly been fueled by the Internet with the rise of social media systems. Anyone can be part of the sharing economy. It is reported that of the 44 percent of U.S. adults who are familiar with the sharing economy, 86 percent say it makes life more affordable, 83 percent say it makes life more convenient and efficient, and 78 percent say it builds a stronger community. The central idea of group consumption is simple: Obtain value which remains in goods or services that are not entirely used by their owners. 

A recent survey from Pricewaterhouse Coopers, the largest professional service firm in the world, shows this so-called "sharing economy" is growing faster than ever. Although we are not sure about the current size of this market, by 2025, according to Pricewaterhouse Coopers, the sharing economy could represent $335 billion in profit worldwide. Nowadays, well-known examples of successful corporations built on group consumption systems include Airbnb, a San Francisco-based online accommodations marketplace, and Zipcar, a car sharing brand that is now part of the vehicle rental service company.

The speed of its growth suggests that the sharing economy might represent a serious threat to established industries, due to fewer purchases in conventional markets. For consumers, it seems to bold the advantage to unite cost reduction, benefit expansion, convenience and environmental consciousness in one type of consumption. Companies therefore should understand the new situation and manage their operating system in order to adapt to current and future business models to provide new sources of profits within this growing area of the sharing economy.

For nearly a decade now, Merebeth has been a self-employed pet transport specialist. Her pet transport job was born of the financial crisis (危机) in the late 2000s. The downturn hit the real estate (房地产) firm where she had worked for ten years as an office manager. The firm went broke and left her looking for a new job. One day, while driving near her home, she saw a dog wandering on the road, clearly lost She took it home, and her sister in Denver agreed to take it This was a loving home for sure, but 1. 600 miles away. It didn't take long for
Merebeth to decide to drive the dog there herself. It was her first road trip to her new job.

Merebeth's pet delivery service also satisfies her wanderlust. It has taken her to every state in the US except Montana Washington, and Oregon, she says proudly. If she wants to visit a new place, she will simply find a pet with transport needs there. She travels in all weathers. She has driven through 55 mph winds in Wyoming, heavy flooding and storms in Alabama and total whiteout conditions in Kansas.

This wanderlust is inherited from her father, she says. He moved their family from Canada to California when she was one year old, because he wanted them to explore a new place together As soon as she graduated from high school, she left home to live on Catalina Island off the Californian coast, away from her parents, where she enjoyed a life of sailing and off-road biking.

It turns out that pet transporting pays quite well at about $30, 000 per year before tax. She doesn't work in summer; as it would be unpleasantly hot for the animals in the car; even with air conditioning. As autumn comes, she gets restless-the same old wanderlust returning. It's a call she must heed alone, though. Merebeth says, "When I am on the road, I'm just in my own world. I've always been independent-spirited, and I just feel strongly that I mush help animals. "

A recent study conducted by the Massachusetts Institute of Technology（MIT）has discovered that river erosion（侵蚀）can lead to increased biodiversity in areas with minimal tectonic（地壳构造的）activity. The researchers focused their attention on the Tennessee River Basin and examined how the erosion of various rock types by the river had led to the separation and diversification of a type of fish called the greenfin darter. As time passed, these separate fish populations evolved into distinct families with genetic differences.

Scientist Thomas Near observed that the greenfin darter was exclusively found in the southern half of the Tennessee River Basin. The researchers analyzed the genes of each fish in Near's data set and constructed an evolutionary tree. This tree helped them comprehend the evolution and differences of the greenfin darter species. They discovered that the fish within the same branch of the river were more closely related to each other than to the fish in other branches.

This study provides evidence that river erosion significantly impacts biodiversity in regions with low tectonic activity. It illustrates how changes in the landscape caused by river erosion can lead to the division and diversification of species over time, even in peaceful environments. These findings enhance our understanding of the mechanisms（机制）that drive biodiversity and evolution, even in areas that are not typically associated with intense tectonic activity.

Subsequently, the team discovered a strong correlation between the habitats of the greenfin darter and the type of rocks present. The southern half of the Tennessee River Basin consists of hard, tightly packed rocks, resulting in turbulent（湍急的）waves in the rivers that flow through it. This characteristic may be favored by the greenfin darter. As a result, the team assumed whether the distribution of greenfin darter habitats had been influenced by the changing rock types, as the rivers eroded the land over time. To test this assumption, the researchers developed a simulation model. Remarkably, the results confirmed their assumption.