human 5 Opportunity costs 4 article 3 opportunity cost 3 Behavioral research 2 Costs 2 Decision making 2 Employment 2 Entrepreneurship 2 Humans 2 Low-opportunity cost time 2 Money demand 2 Opportunity cost 2 Technology: general issues 2 Wages 2 controlled study 2 cost effectiveness analysis 2 female 2 infant 2 3-D printing 1 3D printing 1 3D tissue engineering 1 3D-printing 1 3d tissue engineerings 1 Academic labor markets 1 Adaptation behaviours 1 Adaptation process 1 Adjunct faculty 1 Adverse selection 1 Advertising 1