The UK's long-term prospects could be "brighter" outside the EU, a business leader has said.
John Longworth, head of the British Chambers of Commerce, described the EU referendum as a choice between the "devil and the deep blue sea".
He told its annual conference that voters faced "undoubtedly a tough choice".
One was staying in an "essentially unreformed EU", with the other being the uncertainty of leaving the union.
"Decision making in business suffers from the pressures of the short-term and is naturally focused on the interests of the particular business concerned," Mr Longworth told delegates.
"If I were to ask the business community one thing in this referendum, it would be to look to the long-term and the wider interests of the society in which you operate, and make your choice based not on the next financial year, but on what you want for your children and grandchildren."
BCC members will be surveyed so their views could inform the debate ahead of the vote in June, he added.