Trade and investment between the EU & US already flourishes, tariffs are already low or non-existent. TTIP isn't about trade. TTIP is about changing our laws for big business at the expense of ordinary people.
Big business on both sides of the Atlantic have a wish list of deregulatory measures that they've been lobbying for for years. TTIP presents the perfect opportunity for them to finally achieve their goals.
While business groups have set the TTIP agenda, citizens in the EU and US have been locked out. The public has no access to joint EU-US negotiation texts, and many of their public representatives remain in the dark.