As in most European countries, the outbreak of World War I brought about the exchange's closure on 27 July 1914, although trading did not cease. Brokers continued trading during the war and equity prices showed a massive increase starting in 1914. By 1918 over 7.2 million securities had been traded in a year. The exchange reopened after the war were, the post-war inflationary environment pushed exchange turnover to exceptional highs, tempered only by the introduction in 1925 of the country's new currency, the pengő. The following four years leading to the market crash of the New York Stock Exchange in October 1929 saw the downturn of the BSCE. On 14 July 1931, the BSCE was closed down again as a result of a German banking moratorium and a series of financial collapses of the continent's major banks. Bond trading officially resumed only in 1932, followed by trading in the 18 most traded equities. Following a short period of recovery, the market entered an expansionary phase in 1934, reaching its peak in 1936. Gustav Szabo became the youngest person ever to have a seat on Budapest Stock exchange at 18 years old when his father died in 1939.