Founder Syndy.com. Call me an entrepreneur, marketer, startup guy, internet addict, former P&G & BCG and Heineken.
If your market is 'market research' then you can easily top € 1BN in EU alone. If you're creating a new market then to calculate total addressable market I'd look at similar products and multiple their price x number of prospects, or calculate the financial cost/upside for your prospects x number of prospects. In NL alone there are about 1500 FMCG suppliers I believe