Traditional surveys of market participants or the general public tend to be biased in their sampling and framed in their responses. As in quantum physics, the act of observing can itself alter behaviour. These realities may call for exploring non-traditional means of revealing people’s preferences and sentiments. To give one recent example, data on music downloads from Spotify has been used, in tandem with semantic search techniques applied to the words of songs, to provide an indicator of people’s sentiment. Intriguingly, the resulting index of sentiment does at least as well in tracking consumer spending as the Michigan survey of consumer confidence. 51  And why stop at music? People’s tastes in books, TV and radio may also offer a window on their soul. So too might their taste in games. Indeed, I am interested in the potential for using gaming techniques, not just to extract data on people’s preferences, but as a means of generating data on preferences and actions. Existing models, empirical and theoretical, often make strong assumptions about agent behaviour. Theoretical models are based on axiomatic assumptions. Empirical models are based on historical  49  Rotemberg (1984), for example, discusses the statistical rejection of rational expectations models for consumption and labour demand. 50 Tuckett and Nyman (2017), Shiller (2017) and Nyman et al (2018). 51 Sabouni (2018). 12  All speeches are available online at www.bankofengland.co.uk/speeches  12  behaviours. These restrictions may, or may not, be borne out in future behaviour.
As for the audit role, we will have to provide internal control assurances to the ECB on all the functions we will be carrying out on their behalf. All of this, of course, has important implications for essential support functions such as information technology and human resources. I need only mention the fact that euro area membership entails considerable electronic reporting obligations and the maintenance of several statistical databases. The Bank is gearing up to take on these new, more specialized functions, and I would like to note that it is only able to do so with confidence because it has a substantial core of qualified and dedicated professionals in all these areas. 6  BIS Review 16/2006