According to the Jacobsen textbook the two demand side facto
     According to the Jacobsen textbook, the two demand side factors generally cited as of primary importance in explaining the decline of male participation are: ons saved 3 1) the sectoral increase in labor demand in sectors where men are predominantly employed, particularly the manufacturing sector and decreased demand of female labor. 2) the sectoral decline in labor demand in sectors where men are predominantly employed, particularly the manufacturing sector and the increased substitution of female for male labor. 3) the sectoral decline in labor demand in sectors where men are predominantly employed, particularly the manufacturing sector and the increased substitution of immigrant labor. 4) the sectoral incline in labor demand in sectors where men are predominantly employed, particularly the manufacturing sector and the increased substitution of female for male labor.  
  
  Solution
Ans) 2 is the correct option. The sectoral decline in labor demand in sectors where men are predominantly employed particularly manufacturing sector and the increased substitution of female for male labor.
The two supply factors that appear to be of primary importance are increasing real wages and increase in nonearned income.

