Do comsumers try to spend their income in ways that give them as much pleasure as possible? общий вопрос
Who try to spend their income in ways that give them as much pleasure as possible? к подлежащему
Consumers try to spend their income in ways that give them as much pleasure as possible, don't they? разделительный
How do comsumers try to spend their income? специальный
Do manufacturers or comsumers try to spend their income in ways that give them as much pleasure as possible? альтернативный