Évolution de l'American Dream et stratification économique

Analyze the evolution of the American Dream in the context of economic stratification. In a paragraph of 80 to 100 words, discuss how the rise of the Gini coefficient from $0.39$ in 1970 to $0.48$ today impacts the belief in 'meritocracy'. Explain why this shift complicates the narrative of 'social mobility' and the 'self-made man'. Ensure you use the terms 'meritocracy' and 'social mobility' in your response.