"proven demand" is an acceptable phrase in written English.
It is used to indicate that the demand for a certain product or service is backed up with evidence. For example, "The apparel company has seen a proven demand for its new line of athleisure wear."
With the proven demand and earning potential for space-related tech, funding opportunities are on the rise.
There is a proven demand for second-hand water cannon and other European forces have expressed an interest in the devices that we are seeking to buy.
With 85 applications submitted last year for the 10 positions available there is proven demand for these kinds of job opportunities and experiences for MIT students.
In fact, some say, the very causes of the sector's growth -- the expensive new treatments science is discovering and the proven demand for them -- are also likely to widen the gap between Americans who can afford the world's best health care and the 40 million others who have no insurance to help them pay their bills.
Don't be afraid of competition — go where the proven demand exists.
Mr Ward said there was proven demand for the redevelopment from retailers who wanted to come into the area.
Picking online orders from stores has proven demanding as store employees must multi-task, switching back and forth from customer service to order picking.
The schedule has proven demanding, but Pate has still found time to enjoy the city – for example, by using a TC student perk to score an $18 ticket to a New York Philharmonic opening weekend concert.
By taking preorders and accepting deposits, you are eliminating your risk by having customers pay up front and are also able to prove demand.
The rise of Kickstarter and Indiegogo have allowed startups to prove demand and avoid taking too much expensive early stage capital.
Essentially, it's like taking a niche product with the Padfone and putting it into an even smaller box thanks to the use of Windows Phone 8, which itself has yet to really prove demand.
