Price of EDC started to fall only in beginning of 2020. In the second half on 2019 price of tokens raise. And leasing program start to actively promoting only in the second half of 2019.
You are right. Price of EDC strarted to raise actively in the second half of 2019 because the leasing program was actively promoting and a lot of people started to lease tokens.
Users see that the price of a coin is basically stable, therefore they invest in a leasing program.
It is necessary that the price of tokens will be stable or raise. Only in such case people will participate in leasing program.
The main thing is that the price does not fall below the price at which you bought the coin before sending it to the leasing program.