A family of four in the US have put themselves up for sale offering to advertise companies for $2 a day.

美国有一家四口近日集体上阵，以一天两美元的价格出售自己，为公司做广告。

In a video posted on YouTube, the family introduce themselves as father Carl, mother Amy, son Layne and daughter Kaitlyn.

In a unique marketing¹ pitch they have offered to wear company sponsored clothing all day and will use social media such as Twitter to promote sponsors.

Calling themselves "The Billboard² Family" they promise to travel around the US and spread the word about any company that wants to sponsor them.

In a video posted on YouTube, the family introduce themselves as father Carl, mother Amy, son Layne and daughter Kaitlyn.

There is also a hospital scan photo of their child that is due on December 31st.

Explaining the idea to sell themselves father Carl said: "We are a real family of 4 (with one on the way) who wears your company shirts all day long, taking loads of photos and videos.

"We then promote your company online on Facebook, Twitter, Flickr, YouTube, and our website, as well as to all of the many people who ask us why we are all wearing the same shirts."

The family charge companies $2 (£1.26) a day to wear their logo, but special days such as New Year's Eve carry a $730 (£460) price tag.

Carl, who has a computer sciences degree, was "inspired" to advertise his family "by his desire to make a respectable living."

He also said to me he "wanted to teach our kids about self-reliance（依赖，信心） and business".

"They're very young but they have been very involved. They also love the attention," he said.

The family come from St Louis, Missouri, but on their webpage say they plan to travel around the US.