"It's correlating the increasing intensity in different bands that provides really important clues about the structure of the source, " Prof Madejski - a co-investigator on the NuStar X-ray telescope, told BBC News.
As ETFs have exploded in popularity, they also have become the source of concern that the structure distorts prices or would break under the strain of investors bailing out en masse.
The key advantage for OLED is that the panel itself emits light, eliminating the need for a light source behind it and keeping the overall structure very thin and light.
The source of malinvestment, according to the Austrian theory, is the systematic distortion of the structure of production that has its origins in government manipulation of the interest rate.