In spring 1948, as the preparatory work for the Congress of Europe in The Hague is taking place, the British economist and industrialist, Paul Chambers, drafts a proposal in which he outlines the priorities and procedures of a future European economic union.

On 3 March 1948, Daniel Serruys, President of the French Section of the Independent League for European Cooperation (ILEC), sends to Duncan Sandys, British Conservative MP and President of the International Committee of the Movements for European Unity, a letter in which he notes and deplores the differences between the British and French notions of European economic unification.

On 8 May 1948, the French economist and statistician, Maurice Allais, gives an address during a meeting of the Economic and Social Committee at the Hague Congress in which he explains that it is necessary to achieve political union in Europe in order to pave the way for its economic union.

On 8 May 1948, Jacques Lacour-Gayet, member of the Economic and Customs Action Committee (CAED) and leader of the French Section of the Independent League for European Cooperation (ILEC), gives an address to the Economic and Social Committee at the Congress of Europe in The Hague in which he expresses his view that the convertibility of all the European currencies should incorporate a regional stage.

On 8 May 1948, the members of the Economic and Social Committee at the Congress of Europe in The Hague observe a heated exchange between René L’Huillier, an activist within the union CGT–Force Ouvrière (General Confederation of Labour–Workers’ Force), and Daniel Serruys, rapporteur of the Committee and leader of the French Section of the Independent League for European Cooperation (ILEC), concerning the role of workers in the management of the economy.

On 8 May 1948, Lady Priscilla Grant of Monymusk, British Conservative MP, proposes to the members of the Economic and Social Committee at the Congress of Europe in The Hague that a committee be set up for the organisation of European emigration and draws attention to the desperate situation of the homeless.

On 9 May 1948, Daniel Serruys, President of the French Section of the Independent League for European Cooperation (ILEC) and rapporteur of the Economic and Social Committee at the Congress of Europe in The Hague, agrees with Francis Leenhardt, Chairman of the Economic Affairs Committee in the French National Assembly, on the importance of harmonising employment conditions in Europe in order to establish complete freedom of trade.

At the end of the Congress of Europe held in The Hague in May 1948, the participants adopt an Economic and Social Resolution setting out the objectives of a united Europe.