I am not at all keen on many of the aspects of the EU and I'm still not sure whether we should remain in it or not. However, I do think the EU has provided more protections for people and at least tried to rein in the power of large corporations.
The EU wanted to introduce a financial transaction tax of 0.1% for the trading in shares and bonds. This isn't a new idea - versions of it have apparently been around since 1694. James Tobin proposed such a tax in 1972 as a means to curb excessive speculation that does not benefit the "real economy" and as a reliable way of ensuring that financial institutions contribute towards taxation.
The problem is more pressing now because of the use of highly sophisticated technology to facilitate high speed trading (millions of sales and purchases being made per second). Those who have early access to market information (those that possess the most sophisticated technology that can detect (and presumably influence) trends) are in effect gaming the market. This sort of gambling mentality can bring great rewards to those that own or have a stake in financial institutions, but can cause absolute chaos to everybody else - as we have already seen.
The suggested tax rate could hardly be called excessive - 0.1% per trade in shares and bonds. There were howls of protest from the finance sector - some people believe this opposition was not because it would be a significant cost to the sector but because it has become so used to calling the shots and is opposed in principle to any measure that seeks to control how its operating methods.
The Conservative Party opposed this tax. The UK economy is very dependent on the financial sector, many argue unhealthily so. To refuse to introduce the tax would serve two purposes - to "keep in" with powerful financial institutions and to attract more business away from EU countries that introduce the tax. Nigel Farage has taken a similar line, saying it was important to protect "the country's biggest industry" from outside interventions.
If we did leave the EU we would, I think, be in a very precarious position - even more dependent on the money coming out of a financial sector that can choose to move its operating hub to another country if it is challenged in any way.