That wave brought rapid urban development, particularly in Tel Aviv, which absorbed a considerable number of the immigrants.
But during the years 1926–1927 an economic crisis occurred in the country, the toughest the Jewish settlement had during the period of the British Mandate of Palestine, and in spite of the economic comeback between the years 1928–1929, the crisis was identified with all of the period of the Fourth immigration.
In February 1924 David Ben Gurion wrote in his diary: "The lack of work is ever increasing.
This group contained many middle class families which had engaged in business, industry, trade.
They primarily moved to the growing cities, establishing small businesses and light industry.