We always think of doing something for long term but we regularly spend a lot of money for short term happiness. I am not saying this for those who have a lot of money, but for those who don't have that much money, there is no need to buy an iphone for around $1200 to $2000 right now.
And I know many cases when iphone is bought on credit. 
Here in the discussions there are often disputes about not investing borrowed money in bitcoin. Compared to buying iphone on credit, this idea looks simply brilliant. It is better to borrow and buy bitcoin (which will bring profit in the future) than to borrow and buy a trinket on credit (which will only bring losses in the future due to the cheapening of the gadget). Btw, I am not agitating anyone to this or that action, but just thinking out loud.Maybe buying an iPhone will give that person temporary happiness but when a person spends that amount of money on investment without buying an iPhone, but in the future he will get a good amount of profit from this investment and it will be seen that he can buy more iPhones from the profit of that investment. But our brains think very little like this, we prioritize what we get in the short term or what happiness we get for the short term as opposed to spending money. But intelligent people always think differently. I already have a smart phone now I don't need to spend two thousand dollars to buy another smart phone where all my work is going on with the previous smart phone. I don't know how many people have thought about this matter that I said here. But everyone should think like this, maybe the investment will not give you big profit in short time but if you can make a habit of holding it for long time then I believe that investor will be successful after reading it for a long time.
This is the whole difference: buying iphone is not an investment, but a waste of money and, in principle, can't bring any profit, but only creates current expenses at the time of purchase. Comparing iphone and investments is like comparing warm with soft.So we have to give up some temporary happiness to achieve something better in the future.
But then manufacturers like Apple will stop making fabulous profits.Those people who chase current happiness deprive themselves of something bigger (for example, income) in the future. Most of the people around are like that. Low financial literacy and the era of mass consumption are to blame.