The macroeconomic question is about the global aggregate impact of IT on business or society.
- Does IT (as a whole) make business (as a whole) more profitable?
- Is there any evidence that businesses with more IT are more profitable than businesses with less IT? (If wealthier companies spend more on IT, does that just show they have more money to spend?)
- If IT has any demonstrable impact at all, is this merely a short-term sugar rush (aka turbulence), or are there enduring long-term consequences?
The microeconomic question is about the extent to which differentiation within IT matters.
- Does one kind of IT produce significantly better results than another kind of IT?
- To what extent do the technical issues to which IT people pay most attention have any real economic significance?
As some aspects of IT are increasingly turned into utility computing, then maybe some of the big questions of IT become small questions, and some of the small questions become irrelevant. At least from an external business perspective.
- Does Open Source matter?
- Does XML matter?
- Does architecture matter?
- ... and so on ...
To whom does IT matter? Does the vast amount of technical knowledge accumulated within the IT industry matter to anyone outside IT? Does IT matter?