Mah Jong modular sofa by Roche Bobois; cushion, back) is about (could be more depending on fabric). So, four pairs of two cushions + two backs (for two facing units) would be min Could start with only one cushion.
What effect will an #increase in income have on the Demand Curve? How will the curves for normal and inferior goods change? Will it have any effect on supply? How will it effect income elasticity of demand? Does this effect the determinant "Share of consumer's budget"? How? Will this change bring changes in poverty rate in the United States?