Plant cell biology is the study of all aspects of plant cells. It is particularly concerned with structure, growth, division, signalling, differentiation and death of plant cells. The authors ...

Labor markets in U.S. cities today are vastly more educated and skill-intensive than they were five decades ago. Yet, urban non-college workers perform substantially less skilled work than decades ...

Many technological innovations replace workers with machines, but this capital-labor substitution need not reduce aggregate labor demand because it simultaneously induces four countervailing responses ...