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prices - how much the product costs from potential competitors;
contextual advertising - is it available, where is it found;
purchase motivator - promotions and special offers;
website usability - is the site convenient, is there a feedback platform, do widgets pop up, can you pay online;
website traffic and groups in social networks.
There are also trendy niches. This japan business email list includes what is "hyped": the product is talked about a lot and actively bought. Examples are gyro scooters, spinners, pop-ups.
What, how and for whom to produce
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These products were sold everywhere several years ago. However, now these names are extremely rare.
These examples make clear the essence of trendy products, you need to find the item that will become extremely popular in a few weeks or months. Don't buy a large batch when interest in the product has started to decline.
It remains high from a month to a year. Rarely does demand for trendy products last longer.
Such items can be found in the West. Just look at what is fashionable there now. If there is something that has become popular there, then this wave will soon reach Russia.