Even if we'd ask for it in every single store, there still not enough of us to make this actions as effective as we imagine it. We need a mass adoption.

It will be necessary and good to ask because it might even be that they don't know much about it which you will be the one to educate them on it. Also stores that accept BTC make sure they post it online for people to know about it. But you can also ask when you get there.

In my opinion, if merchant accepting bitcoin, they will put bitcoin logo in front merchant. In my country, its almost impossible spending our bitcoin to shopping because government regulation ban it

bitcoin is prohibited as a legal payment instrument in many countries. so that almost all stores do not accept bitcoin as payment.
but there are several altcoins that are starting to develop as payments. like Vexanium which functions as a voucher, and now Vexanium has just begun collaborating with KFC. and in the future will work with many online stores.

You can ask any store if they accept bitcoin, but we don't know that they accept bitcoin if after you asking they will agree that you can buy any product to them through bitcoin. Its good when that happen but I think its possible because they not familiar to bitcoin, they don't know what is bitcoin that's why it hard to them to agree bitcoin.

I agree that the store will inform if they accept bitcoin so that you can use your bitcoin if buy some stuffs on that store. Asking the stores if they accept bitcoin is good idea simply because if you do not have enough cash and all you have is bitcoin you can ask that store if they accept bitcoin. Lastly, I think there is a big possibility that in the near future many store will accept and allow bitcoin as payment of their costumer.

Yeah, maybe they think it's so difficult to pay with bitcoin. Because the physic isn't real. And the price isn't stable. Maybe they will change their mind but it takes time not so fast. That will be good if they change their preception and want to accept bitcoin. And maybe this is a step what will make bitcoin better than before.

  That would be weird.

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This is a good idea indeed, this requires a bit of boldness but it would defintely make vendors to think of accepting cryptos. Otherwise if there is no demand for it, vendors are doing it only for pubilicty.

Also the other questions is how would they accept cryptos, by regular transactions? For every day products it takes too long  to do . We need POS therminals which use NFC.

I agree. The stores follow a specific policy, which is accepted widely in the business sector of the country where it is in or the place where it is built. Therefore, one can't impose or demand from them that they should accept cryptocurrencies as a mode of payment just because it is beginning to be recognized worldwide. I think that critical point for that to be a reality is if we will first focus on helping it grow in such a state that it will be widely accepted and be trusted by the masses that it would be given a chance to be accepted by stores or big chain businesses that would help it gain more reliability.

I think it's ineffective in a store that receives bitcoin. I think it will be published in the mass media and it will be an advantage for us because we don't have to ask the store every time.