This is Direct Proportion. If, for instance, the number of teachers in a school increased by one for every 30 students, the two (number of students and number of teachers) would exist in a directly proportional relationship.
Defined it means: uncalled for; lacking good reason; unwarranted.
In simple language it means, spending that is unnecessary, impulse purchases or fun things we but just because.
I would have to say <span>“communicate” and “drop them a line.”</span>
