'all travelers are not tourists'justify?

In three to four sentences, explain the effect of a price ceiling on the quantity of a good and who this intervention intends to assist

Penny poodle wanted to know which dog obedience training program was more effective: puppy pride, the approach she has been using for any years, or doggie do-right, a new approach. penny convinced 50 human companions of untrained dogs to participate in her study. the dogs and their humans were randomly assigned to complete the puppy pride or doggie do-right course. at the end of the training programs, all of the dogs were scored on their level of obedience on a standardized dog obedience checklist (scores could range from 10 to 100). the design of this study is:

Rahm's credit card issuer calculates interest based on the outstanding balance at the end of the last billing period. what is this method of calculating interest on a credit card called?