The WTO, UNCTAD, World Bank and OECD continue to monitor progress countries have made in reducing tariffs and liberalizing trading systems, including reducing entry barriers in key sectors.

WHITEHOUSE: The Los Cabos Growth and Jobs Action Plan

Stock exchanges around the world have been partnering or merging with other platforms to save cost and compete better against the newer electronic exchanges, which are reducing the barriers to entry for trading.

FORBES: CME Group Shows Restraint By Not Launching NYSE Bidding War With Deutsche Boerse

Robert Greifeld, Nasdaq's chief executive officer, said the deal was long in coming and gained purpose with the passage of new regulations last month that encourage electronic trading and seek to eliminate the barriers between competing markets.

FORBES: Not So Fast, Big Board

It would be better for regulators, in America and elsewhere, to knock down existing barriers to full-blown competition between trading places.

ECONOMIST: Stockmarket regulation

Known as the "Big Bang, " for the many changes made at once, the 1987 deregulation moved trading from the floor to electronic screens and blew away barriers to entry, bringing in bankers and businesses from around the world.

WSJ: Former British Prime Minister Margaret Thatcher Dies

Pakistan is unpicking official barriers to trade, after last year offering most-favoured nation trading status to India (reciprocating India's 1996 offer).

ECONOMIST: India-Pakistan relations