AL 經濟MIRCO

income is a series of events because income is a flow.it records the amount you receive for the whole period
wealth is not a series of events because it only records the amount you have at a particular time.it is stationary at that time

you can refer to the book called 'income is a series of event'.it has both english and chinese verson

hope it can help you

收入是指一段時間內的事,例如你一整年都有人工
財富是指特定時刻,例如你這秒鐘有多少錢